42. Which compound would be expected to show an intense peak in the mass spectrum at m/z 58？
(A) CH₃C(O)CH₂CH₂CH₃
(B) CH₃CH₂C(O)CH₂CH₃
(C) (CH₃)₃CCHO
(D) (CH₃)₂CHC(O)CH₃
(E) (CH₃)₂CHCH₂CHO

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