no, it's possible to have two modifiers, connected by a comma, modifying the same noun. (<-- look, i just did it)
here's an official problem in which it happens:
the-anasazi-settlements-at-chaco-canyon-were-built-t2236.html

the main problem with choice (d) is the fact that “carrying...” is written as a modifier, so that there is an implication that it describes the following clause. i.e., the implication in choice (d) is that those comparative facts about minivans vs. other vehicles are only true when the minivans are actually "carrying up to seven passengers".

these facts -- the fact that minivans carry up to seven passengers, and the fact that they are X and Y and Z in comparison to other vehicles -- should be in parallel (as they are in the correct answer), since they are separate facts, of the same type, of equal priority.

i think it doesn't function as an adverbial modifier and modifies the whole clause.

Ron said to us that we should learn from correct answer.

I quite understand that oa is A.

in oa A, "compared" modify subject of preceding clause, a far noun. Normally, do-ed modifies nearest noun. But in this correct answer, do-ed can modify far noun/subject of preceding clause.

so, in some cases, logic forces us to accept that do-ed can modifies a far noun and the rule that do-ed mofified nearest noun is not absolute.