(3)Some students enroll in summer classes. (4) A full years load of material is crammed into a six week course.

Which revision combines sentences 3 and 4 using a dependent clause?
Select one:
O a. Some students enroll in six-week summer classes.
O b. Some students cover a full-year's load of material in summer school.
O c. Some students enroll in summer classes, and they cram a full-year's
course into six weeks.
O d. Some students enroll in classes that cram a full-year's load of material
into a six-week course.