Which of the Following Is a Common Feature of Catechol

Which of the following is a common feature of catechol, hydroquinone, and resorcinol?

A) They all have two methyl groups as substituents on a benzene ring.
B) They all have two hydroxyl groups as substituents on a benzene ring.
C) They all have one methyl and one hydroxyl as substituents on a benzene ring.
D) None of the above, these compounds do not have any common features.