SAT English Practice Question

The scientist’s research on the effectiveness of a new type of fertilizer had a positive impact on agricultural practices. Specifically, the new fertilizer helped farmers to increase crop yields and reduce the use of harmful pesticides. Although the scientist’s research had a positive impact on farming practices, the scientist found that the new fertilizer could not be used to grow certain types of crops. What is the most likely reason why the writer uses a semicolon in this sentence?

1. A.join two closely related independent clauses.
2. B.separate a dependent clause from an independent clause.
3. C.indicate that the writer is about to provide an example.
4. D.set off a nonessential phrase or clause.