Bunuel
The Coriolis Effect is responsible for the apparent forces that turn ocean currents and storm systems clockwise in the Northern Hemisphere, but what is appearing as a force is just the inertia of the matter that obeys Conservation of Angular Momentum.
A turn ocean currents and storm systems clockwise in the Northern Hemisphere, but what is appearing as a force is just the inertia of the matter that obeys
B in the Northern Hemisphere turn ocean currents and storm systems clockwise, but what appears to be a force, just the inertia of the matter, obeys
C turn ocean currents and storm systems in the Northern Hemisphere clockwise, that appear as a force, and that is just the inertia of the matter, which obeys
D turn ocean currents and storm systems clockwise in the Northern Hemisphere, but what appears as a force is just the inertia of the matter obeying
E have turned ocean currents and storm systems clockwise in the Northern Hemisphere, and that is just the inertia of the matter that appears as a force obeying
Magoosh Official Explanation:
The first issue is what follows the “that” clause. Here, “that” should be in the relative pronoun role discussed in this blog. The word “that” is the subject of the clause it begins. We don’t need another pronoun, “they“, and this pronoun would have no clear antecedent anyway. Choice (A) & (B) are incorrect.
The idea of the second half is that what appears as a force is something else. In the first place, we need a contrast word, to mark the difference from the power expressed in the first half of the sentence. The word “but” in choices (B) & (D) is best. Choice (C) mechanically puts all the elements in the second half in parallel, but logically, they are not parallel element. The “appearing as a force” is in sharp contrast to being “just the inertia of the matter”, and putting these two in parallel obscures that contrast. Choice (C) is incorrect.
The infinitive “to obey“, at the end of the underlined section, is awkward. It seems to suggest purpose, but of course nothing is doing anything for the purpose of obey a law of Physics. We just want to describe a consequence of the behavior of the matter, so the participle, “obeying“, would be more appropriate. Choice (E) has the infinitive and is incorrect.
Choice (D) makes no mistakes and correct communicates the relationship of ideas in the second half.
Choice (D) is the best answer.