Excerpt from The Secret Garden
Frances Hodgson Burnett

So if Mary had not chosen to really want 8 to know how to read books she would never have learned her letters at all.
Read the passage underlined (8). There may be a mistake in punctuation, capitalization, or spelling. If you find a mistake, choose the answer that corrects the mistake. If there is no mistake, choose ‘Correct as is.’
A) Correct as is.
Eliminate
B) to know how to read, books she would never have learned
C) to know how to read books, she would never have learned
D) to know, how to read books she would never have learned