Explanation
Correct answer: D.
Choice D is the best answer. The convention being tested is punctuation use between sentences. In this choice, the period is used correctly to mark the boundary between one sentence (“In 2017...Nutcracker”) and another (“According...culture”). The supplementary element “according to reviewers” modifies the main clause of the second sentence (“the Toledos’...culture”).
Why the other choices are wrong
Choice A
Choice A is incorrect because it results in a run-on sentence. The sentences are fused without punctuation and/or a conjunction. Furthermore, no punctuation is needed within the supplementary element “according to reviewers.”
Choice B
Choice B is incorrect because it results in a comma splice. A comma can’t be used in this way to mark the boundary between sentences.
Choice C
Choice C is incorrect because it results in a run-on sentence. The sentences are fused without punctuation and/or a conjunction.