Read the following excerpt from a student essay. How can the writer best improve his or her sentence fluency?
Like all penguins, king penguins are mainly black and white, but they have distinctive touches of color. Adult king penguins have black feathers on their backs. Their chests are white. They have orange feathers on their ears and throats. Along the bottom part of the bill, adults also have an orange streak. Juveniles of the species look much like the adults. However, their black feathers may be tipped with gray. Yellow feathers appear on their ears. Their lower necks have grayish white color. Chicks have brown downy feathers until they molt. They molt at about eleven months of age.
A. by varying how sentences begin
B. by varying sentence length
C. by simplifying the first sentence
Pick the correct answer from the listed options and provide the letter of the selected option.

B