GMAT Sentence Correction (SC) | Cultures.

In some cultures, speaking in a direct manner is valued whereas in others doing so is considered rude.

A. in a direct manner is valued whereas in others doing so is considered
B. in direct manner is valued whereas in others doing so is considered
C. direct is valued whereas in others doing so is considered
D. directly is valued whereas in others doing so is considered to be
E. directly is valued whereas in others doing so is considered

The correct answer is marked. Please help why it is correct.
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