One key feature of Impressionist painter Claude Monet's _________ emphasizes the changing quality of light and color over time.
Which choice completes the text so that it conforms to the conventions of Standard English?
technique is "en plein air." Which
technique: is "en plein air" which
technique is "en plein air" which
technique is "en plein air," which
Correct Answer: D
Choice D is the best answer. The comma correctly precedes the non-restrictive relative clause "which emphasizes..."
Choice A is incorrect because it creates a fragment. Choice B is incorrect because a colon cannot separate the subject from the verb. Choice C is incorrect because a comma is needed before "which" in a non-restrictive clause.