Answer: Option (a) is the correct answer.
Explanation:
When solvents which contain a hydrogen atom attached to an electronegative atom then they are known as protic solvents.
For example, in the hydrogen atom is attached to electronegative oxygen atom.
Hence, methanol is a protic solvent.
In , the hydrogen atoms are attached to carbon atom which is not electronegative in nature.
Hence, is not a protic solvent but it is an aprotic solvent.
In , there is no hydrogen. Hence, it is also not protic solvent.
Thus, we can conclude that out of the given options is a protic solvent.