Vivian June Isoult French MBE (born 1945) is a British writer of picture book texts, novels, plays, and non-fiction for children and young adults.
 She has written more than 250 books – including the picture book "Oliver's Vegetables" (1995) and the The Tiara Club series of chapter books illustrated by Sarah Gibb (from 2005) – which have sold more than three million copies.
 Another series, Tales from the Five Kingdoms, has been described as "hilarious adventures with wicked witches, trolls, bats and fairy-tale magic" (Books for Keeps) and the "Sunday Telegraph" has called French "a sublime story-teller".
 Her picture book, The Most Wonderful Thing in the World (2015) illustrated by Angela Barrett, has received universal acclaim.
A wimmelbilderbuch (German, literally "teeming picture book") or a hidden picture book is a specific kind of large-format picture book.
 It is characterized by full-spread drawings (sometimes across gatefold pages) depicting scenes richly detailed with numerous humans, animals, and objects.
 Typically made for children, the drawings are filled with characters and items that may be discovered.
The Charlotte Zolotow Award is an American literary award presented annually for outstanding writing in a picture book published in the United States during the preceding year.
 By contrast, the Caldecott Medal is for outstanding illustration in a picture book.
 The Zolotow award was established in 1998 by the Cooperative Children's Book Center (CCBC) at the University of Wisconsin–Madison School of Education and named to honor the work of Charlotte Zolotow, an American children's book editor and author.
 Ms. Zolotow worked with Harper Junior Books for 38 years during which time she wrote more than 70 picture books.
 Zolotow attended the University of Wisconsin in Madison on a writing scholarship from 1933-36.
 The Cooperative Children's Book Center is a children's literature library of the School of Education, University of Wisconsin–Madison.
The Great Kapok Tree is an American children's picture book about rainforest conservation.
 It was written and illustrated by Lynne Cherry preview from the original picture book "Archie, Follow Me" (New York: Dutton, 1990) out of print and was originally published by Harcourt Brace Jovanovich in 1990.
 The book is dedicated to Chico Mendes, a Brazilian environmental activist who was murdered in 1988.
August House is an independent children's book publisher established in 1978 and currently headquartered in Atlanta, Georgia.
 August House principally focuses on publishing children's folktales, picture books, early-grade chapter books, and storytelling resource materials.
 August House also manages two imprints: Story Cove, an interactive picture book and multimedia series geared towards helping teachers meet classroom Common Core Standards for reading, and LittleFolk, August House's picture book line.
Paul Francis Bright (born 19 March 1949) is an English writer, mainly of picture books and poetry for children.
 His stories have featured on BBC CBeebies and CITV’s Bookaboo programmes.
 Bright has also written stories for CBeebies radio, and for the BBC Jam and BBC RaW web sites, as well as poems for school reading schemes.
 His picture book "Quiet!"
, illustrated by Guy Parker-Rees, was shortlisted for the Blue Peter Book Award (2004) and "I’m Not Going Out There!"
, illustrated by Ben Cort won the Stockport Schools’ Book Award (2007).
 "Crunch Munch Dinosaur Lunch", illustrated by Michael Terry, was shortlisted for the Red House Book Award (2010).
 His most recent picture book, "The Hole Story", with illustrations by Bruce Ingman, was shortlisted for the 2017 English 4-11 Picture Book Award, given by the English Association .
 Bright is one of four authors selected to write new Winnie-the-Pooh stories for ‘The Best Bear in all the World’, an official sequel to the classic stories by A. A. Milne, published in October 2016 to celebrate 90 years since the publication of "Winnie-the-Pooh".
 Bright has appeared at the Edinburgh International Book Festival and the Wigtown Book Festival.
 His name consistently features in the lists of the top 500 most borrowed authors from UK public libraries
Rosa is a children's picture book written by poet, activist, and educator Nikki Giovanni and illustrated by Bryan Collier.
 A biography of African-American civil rights activist Rosa Parks,
Molly Garrett Bang (born December 29, 1943) is an American illustrator.
 For her illustration of children's books she has been a runner-up for the American Caldecott Medal three times and for the British Greenaway Medal once.
 Announced June 2015, her 1996 picture book "Goose" is the 2016 Phoenix Picture Book Award winner – that is, named by the Children's Literature Association the best English-language children's picture book that did not win a major award when it was published twenty years earlier.
Ed Vere (born 7 February 1973) is a British writer and illustrator of children's books.
 He won the Highland Children's Book Award in 2007 for his book, "The Getaway" and was shortlisted for the Kate Greenaway Medal for children's book illustration, recognizing his 2008 picture book "Banana".
 His third book, "Mr. Big" was chosen by Booktrust as the official Booktime book for 2009 and was subsequently distributed to 750,000 British schoolchildren making it the largest single print run of a picture book in the UK.
 In 2009, his fourth book, "Chick" won the Booktrust Early Years Award for Best Baby Book.
 His book "Bedtime for Monsters" was shortlisted for the 2011 Roald Dahl Funny Prize.
Rosa Louise McCauley Parks (February 4, 1913 – October 24, 2005) was an activist in the Civil Rights Movement, whom the United States Congress called "the first lady of civil rights" and "the mother of the freedom movement".

Question: What what the children's picture book "Rosa"'s character an activist in?
Answer: the Civil Rights Movement