Explanation
Correct answer: A.
Choice A is the best answer. The convention being tested is the use of verbs to express tense. In this choice, the present tense verb “benefit” is consistent with the other present tense verbs (“is,” “stands,” and “are shared”) used to describe worker cooperatives and how they function.
Why the other choices are wrong
Choice B
Choice B is incorrect because the past tense verb “benefited” isn’t consistent with the other present tense verbs used to describe worker cooperatives and how they function.
Choice C
Choice C is incorrect because the past progressive tense verb “were benefiting” isn’t consistent with the other present tense verbs used to describe worker cooperatives and how they function.
Choice D
Choice D is incorrect because the past perfect tense verb “had benefited” isn’t consistent with the other present tense verbs used to describe worker cooperatives and how they function.