You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: 10-LETTER WORDS 
Clue: It means to set free, as from slavery
emancipate

Category: THE 1970s 
Clue: In 1977 Bank of America changed the name of its Bank Americard to this 4-letter word
visa

Category: ART SUPPLIES 
Clue: A pad of paper for quick drawings, it appears in a Washington Irving title along with Geoffrey Crayon

sketch book