Which one of the following statements about the mass spectrum of CH3Br is correct?

Last two peaks are of equal size at m/z values of 94 and 96

Last two peaks are in the ratio of 3:1 at m/z value of 94 and 96

Just one peak for molecular ion at m/z values of 95

Just one peak for molecular ion at m/z value of 44

The mass spectrum of CH3Br (methyl bromide) shows two peaks at m/z values of 94 and 96, corresponding to the molecular ions [CH3Br]+.
These peaks are due to the natural abundance of bromine isotopes, 79Br and 81Br, which are present in a ratio of approximately 3:1.
As a result, the peak at m/z 94 ([CH379Br]+) is about 3 times more intense than the peak at m/z 96 ([CH381Br]+).