27. Choose the structure consistent with the following data.
C4H8O : 1H NMR spectrum, δ 1.05 (t, 3H), 2.13 (s, 3H), 2.47 (q, 2H)IR spectrum (strong peak near 1720 cm-1)
(A)
(B)
(C)
(D)
(E)

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