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I believe the pronoun "what" is already properly placed.
The correct answer is A. Guests help themselves from a buffet table. This is a modernized version of the original middle ages French service. Even the word buffet originates from the French language.
A parallel structure means that the same form of the word is used in each part of the sentence. So the correct answer is 'I look forward to visiting Phoenix and to meet Rachel'. For this sentence to be correct, it would need to say 'I look forward to visiting Phoenix and meeting Rachel'.
