Choose the correct sentence which is built from the words and phrases given:
I / let/ borrow/ novel/ but/ you/ promise/ return/ next week.
A. I’ll let you borrow the novel but you must promise to return it next week.
B. I’ll let you to borrow the novel but promise to return it next week.
C. I'll let you borrow my novel but you promise return it next week.
D. I’ll let borrow the novel but you must promise to return next week.