Can you correct this sentence?

Question

Indeed, much of the material that he had picked up along the way-jazz, blues, and ragtime-he incorporated into his symphonies.

A. no change

B. ragtime-were being

C. ragtime-are

D. ragtime, would be

Answer 1

Go with no change here.

The reason I say this is the parallel construction: "he had picked up" and "he incorporated." Sounds like it flows more smoothly than the other choices, doesn't it?

Cheers!