In this question, the underlined portion of the sentence contains a pronoun + verb (they accumulate), whereas the other items in the list are nouns (changes, runoff). In order for the underlined item to match the other two items, it must
become a noun. Only (D) contains a noun, so it is correct.
Example #2
Because they have a highly developed sense of
vision, most lizards communicate by using clear body
2. F. NO CHANGE
G. changing
H. to change
J. a change of
language, to change their colors and displaying their
2
athletic abilities.
dinlarin Theunderlined item must be a gerun