GMAT Sentence Correction (SC) | Re: Roughly twice each century the planet Venus passes between the earth a

Roughly twice each century the planet Venus passes between the earth and the sun,an occasion known as a transit of Venus, during which it makes the outline of the planet visible in stark relief.

(A) during which it makes the outline of the planet visibleIt is ambiguous
(B) during which the outline of the planet becomesCorrect
(C) so that it makes the outline of theplanet It is ambiguous
(D) such that during which the outline of the planet becomes such that is wrong here and the sentence is
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