13. Read this paragraph.
(1) Bench-pressing, barbell-squatting, running sprints, doing ab crunches, and playing
basketball, the gym is where Khalid loves to burn energy. (2) On Mondays, Wednesdays,
and Fridays, he exercises one upper body muscle group, which includes the following
muscles: pectorals, triceps, and deltoids. (3) On Tuesdays, Thursdays, and Saturdays, he
exercises biceps, latissimus dorsi, and forearms, which comprise the other upper body
Which sentence contains an error in its construction and should be revised?
sentence 1
sentence 2
sentence 3
sentence 4