Yes, it is grammatically correct because of the correct usage of the verbs.
The answer is C because in French there is something called le COD and Le COI le COD is the doctor which is replaced by Le but there is no COI in this sentence
Bonjour,
Mon musicien préféré est Mozart.
Sa musique classique est très belle.
Mozart était petit, mince, et son teint était très pâle.