74. What carbonyl compound and what phosphonium ylide are required for the synthesis of the following alkene?
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(A) only (1)
(B) only (2)
(C) only (3)
(D) (2) and (3)
(E) (1),(2),and (3).

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統計： A(0), B(0), C(0), D(9), E(0) #2347850