Lewis writes that Arnold found “something so extraordinary that it would forever alter the course of his life-and American history." How did Arnold's experience alter the course of American history? (cause and effect)

option 3

explanation:

in the following paragraph, the fourth sentence the correct answer is: three personal subject pronouns

”she was embarrassed when she found that they had been put back on the shelves…”

a   subject pronoun is a personal pronoun. i, you, he, she it, we, they.  

in the sentence it can be observed she, used twice and they used once. is for this reason that is a three personal subject pronoun sentence.