Which Molecular Formula Is Consistent with the Following Mass Spectrum

Multiple Choice

Which molecular formula is consistent with the following mass spectrum data? M^{+ .} at m/z= 72, relative height=73.0%
(M+1) ^{+ .} at m/z= 73, relative height=3.3%

A) C₄H₁₀O
B) C₄H₉N
C) C₅H₁₂
D) C₄H₈O
E) none of these