On the other hand!:
I found some rationale of A:
Most of us rejected A because the "like" is used to introduce an example.
Well, it is not.
The "like" introduces a comparison here and is thus used correctly.
Quote:
A) Until 2010, a state tax regulation known as the “80-20 rule” required that condominium associations receive at least 80 percent of their gross income from their tenant-shareholders, and no more than 20 percent from other sources, like ground-floor rent for restaurants.
The ground floor rent IS NOT one of income sources for the condominum associations (CAs), but it IS one of income sources for restaurants. So, the "other sources" for CAs are compared to the other sources for restaurants (
such as ground-floor rent), and the "ground-floor rent" is not an income source for CAs, thus it is not an example of "other sources" for CAs.
This is the case with the "like".
Further, "required that" uses correct Command Subjunctive. As to the previous posts, the "have" in the second clause can be omitted without any damage to the sentence. It is redundant. The comma before "
, and" is also correctly placed, as a comma between two long parallel clauses should be (also before the coordinating conjunction
and!).
A is the best answer choice, though hellishly convoluted. Perhaps we all fell victims to the inflexible way of thinking, putting an obtuse grammar rule way above... thinking

.