Accuracy leads to speed, so it is as simple as squeezing the juice out of each question. Ideally, you never have a backlog of questions to review and only do more questions when you need more reviewables.

This is logically incorrect based on De Morgan's law.

You might have already finished studying, but I'll leave this for posterity.

The part that is wrong in your interpretation is the "Novel is most complicated". Instead, the answer choice states that the novel has a more complicated plot in comparison to the others. Plot is the subject being described to be complicated, not the novel itself.

You would be correct if the answer choice stated that Shield's first novel is more complicated than any other she has written. Then we go into the plot in the conclusion being complicated.

Instead, the answer choice only solidifies the relative vs. absolute flaw.

It seems to me that the explanation for answer choice B is simply incorrect. It is not wrong because of the example portion, since the AP is simply an extension of the example noted by JY.

I'd argue it is wrong because vertical mixing is not a cause, its the prevention of vertical mixing that is the cause.

Moreover, the text explanation for B is pretty bad too. If I eat cereal every morning, then I have no and/or reduced cereal for whatever reason - that is inherently affecting my feeding habit.

Also, no discussion of larger sea animals in C? It is an assumption, no doubt.

Granted, C is a better answer choice than B by a long shot. But given the intricacy of the wrong explanation for B... I'd expect that level of intricacy in the right answer choice as well.