The efficiency of a solar panel is determined by the quality of its silicon ___________ monocrystalline, polycrystalline, and thin-film.
6
writingWhich choice completes the text so that it conforms to the conventions of Standard English?
A
cells,
B
cells;
C
cells; which are
D
cells:
Correct Answer: D
Choice D is the best answer. A colon is used to introduce the list of silicon cell types.
Choice A is incorrect because a comma is too weak. Choice B is incorrect because a semicolon separates independent clauses. Choice C is incorrect because "which are" makes the list a dependent clause, making the semicolon incorrect.