Read the sentence: to finish the class, you must write a paper with five paragraphs. where do parentheses belong in the sentence?

a. to (finish the class), you must write a paper with five paragraphs.
b. to finish the class, you must write a paper (with five paragraphs).
c. to finish the class, (you must write) a paper with five paragraphs.
d. to finish the class, you must write (a paper) with five paragraphs.