Based on my understanding, A is correct because it provides support to the last sentence of the second paragraph. The author says Einstein's idea may point to what drives acceleration of the universe so with A in mind now this furthers their claim which also supports the first theory about dark energy that the author presents as the cause of space stretching. The author brings up Einstein in support of the dark energy theory so A helps his case by saying Einstein's proposition doesn't only explain why the universe is not shrinking under its own gravity but is needed to explain accelerated expansion (other astronomical phenomena). D is incorrect because distance between objects at other galaxies does not lend support to the author's first theory about accelerated expansion being that there is no mentioning of anything concerning gravity or distance during the explanation of the first theory.
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Based on my understanding, A is correct because it provides support to the last sentence of the second paragraph. The author says Einstein's idea may point to what drives acceleration of the universe so with A in mind now this furthers their claim which also supports the first theory about dark energy that the author presents as the cause of space stretching. The author brings up Einstein in support of the dark energy theory so A helps his case by saying Einstein's proposition doesn't only explain why the universe is not shrinking under its own gravity but is needed to explain accelerated expansion (other astronomical phenomena). D is incorrect because distance between objects at other galaxies does not lend support to the author's first theory about accelerated expansion being that there is no mentioning of anything concerning gravity or distance during the explanation of the first theory.