Read the sentence below and answer the question.
... During the school year, Cassie struggled with several subjects, including performing on math tests, to develop good work habits and studying every night....
(the underlined section is in colons)
Which substitute for the underlined part of the sentence is most effective in correcting its structure?
to perform on math tests, to develop good work habits, and studying every night.
to perform on math tests, to develop good work habits, and study every night.
performing on math tests, developing good work habits, and studying every night.
Leave as is.