Answer: Option (d) is the correct answer.
Explanation:
A ketone is an organic functional group that contains a carbon and oxygen atom bonded together through a double bond, that is, C=O.
For example, acetone is a ketone.
Whereas a hydrocodone is a drug which is used to relieve from moderate to sever pain.It is mostly combined with other drugs and resulting in a chemical formula .
A camphor is a volatile white color substance with chemical formula . It has aromatic smell and its taste is bitter.
A menthone is also an organic compound with chemical formula .
Thus, we can conclude that out of the given options the simplest ketone used as an organic solvent is acetone.