20. Select the most reasonable formula for the compounds with the following mass spectral data: M+ at m/z 101 with a minor M+1 peak.
(A) C5H9Cl
(B) C5H12N2
(C) C6H15N
(D) C9H12O
(E) C6H9S

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統計： A(2), B(4), C(11), D(0), E(0) #941844