838. The underlying physical principles that control the midair gyrations of divers and gymnasts are the same as the body orientation controlling astronauts in a weightless environment.

(A) as the body orientation controlling
(B) as the body orientation which controls
(C) as those controlling the body orientation of
(D) ones to control the body orientation of
(E) ones used in controlling the body orientation of

Solution:

Parallelism

In C, the principles controlling the “midair gyrations… and gymnasts…” are compared to the principles (those) controlling “body orientations”--“The underlying physical principles that control the… are the same as those controlling…” Hence, C is the best choice.
In A and B, “principles” are being compared to “body orientation of…”
In D and E, “as” is missing.

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