Explanation
Correct answer: D.
Choice D is the best answer. The convention being tested is the use of punctuation within a sentence. This choice correctly uses a comma to mark the boundary between the main clause ("The short...Stars") and the supplementary element ("an anthology...descent") that provides additional information about what Reclaim the Stars is.
Why the other choices are wrong
Choice A
Choice A is incorrect because it results in a rhetorically unacceptable sentence fragment beginning with "an anthology."
Choice B
Choice B is incorrect. Joining the main clause and the following supplementary element with the conjunction "while" results in a confusing and ungrammatical sentence.
Choice C
Choice C is incorrect because it fails to mark the boundary between the main clause and the supplementary element with appropriate punctuation.