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= 84, relative height=10.0%
(M+1) ^{+ .} at m/z= 85, relative height=0.56%

A) C₅H₁₀O
B) C₅H₈O
C) C₅H₂₄
D) C₆H₁₂
E) C₄H₆O₂