Correct option is D
Given:
The family consists of 7 people with three couples.
Solution:
From the given information Identifying Relationships
Artist + Politician: This couple has three children.
Teacher: Sister-in-law of the Accountant implies that she is married to one of the siblings of the Accountant.
Accountant + Engineer: This couple is another pair in the family.
Doctor + Businessman: These two are brothers, but their marital status is not specified.
Possible Relationships:
The Teacher is not married to the Accountant (since she is his sister-in-law).
The Accountant must be married to someone else (the Engineer).
The Teacher could potentially be married to either the Doctor or the Businessman since they are brothers.
The teacher could be married to the doctor (as the businessman is not listed among the options)
Thus, correct answer is (d) Doctor