Correct Answer:
B. with
The error in the sentence "He is married with a doctor" lies in the preposition used. The correct preposition to use with the verb "married" when referring to the person one is married to is "to," not "with."
Therefore, the grammatically correct sentence should be: He is married to a doctor.
- "Married to" indicates the person one is united with in marriage.
- Using "married with" is incorrect in this context and can sometimes imply having children with someone, or being married and having something else alongside it, but not the direct marital partner.
Understanding correct preposition usage is crucial for clear and accurate communication in English. This specific error is common, highlighting the importance of learning fixed expressions and their associated prepositions.