Ik this is an old thread but could someone explain why B would be the answer in a bit more detail please XD
Methanol (CH3OH) has two non-equivalent proton environments, and so this gives two peaks. These two environments are: CH3-O and OH. These two peaks will be singlets; a singlet means that the proton environment in question isn't adjacent to (next to) any other protons.
The three protons in the CH3-O group are adjacent to an oxygen atom, and not any other protons, so this will give a singlet. The one proton in the OH group also isn't adjacent to any other protons, so this will give a singlet too.
In terms of the other answers, they all only have one singlet peak.
Methanol (CH3OH) has two non-equivalent proton environments, and so this gives two peaks. These two environments are: CH3-O and OH. These two peaks will be singlets; a singlet means that the proton environment in question isn't adjacent to (next to) any other protons.
The three protons in the CH3-O group are adjacent to an oxygen atom, and not any other protons, so this will give a singlet. The one proton in the OH group also isn't adjacent to any other protons, so this will give a singlet too.
In terms of the other answers, they all only have one singlet peak.