GMAT Sentence Correction (SC) | Re: Knowledge of the winter behaviour of emperor penguins has

Some of us are missing an important thumb rule. In SC, choice A must be a replica of the underlined part. In this topic, it is not. Either we have to underline the preposition ‘of’ in the stimulus or amend A by removing the preposition ‘of’ (the first word)

If we underline the preposition in the stimulus, then C is the answer. Alternately, If we do not underline the preposition, then we have to drop it from choice A, in which case, E will be the choice as per the requirement correct syntax.
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