--Is it because B is essentially saying that "In crowd A, crowd A consume nutrients insufficiently and have...."??, thus redundant.
--yes. in fact, it's much worse than redundancy; it actually creates the nonsense meaning that people are somehow inside themselves while consuming nutrients.
Again, the second version isn’t WRONG, but it’s a silly and inefficient way to write that particular sentence.
The same is true of (E): why say “household cleaning products may not be thought of, by consumers, as…” when we could just start the sentence with a nice, clean subject and verb (“Consumers may not think of household cleaning products…”), like the version in (D)?
The biggest problem with (E) is that it’s a passive version of (D). Passive voice isn’t automatically WRONG on the GMAT, but you need to have a really, really good reason to use it. Consider the following two sentences:
Charlie ate three kilograms of dosas. → Active voice
Three kilograms of dosas were eaten by Charlie. → Passive voice
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finish不能用进行时态
C选项rise和increase重复，时态不平行