Complete the sentence with a suitable question tag:
Your father owns the drugstore near my house, ?
A. does he?
B. will he?
C. doesn't he?
D. is he?

Hint: In the case of a negative statement, the tag use should be positive. In the case of a positive statement, the tag used should be negative. The tense of the tag used is decided by the tense of the auxiliary or modal verb of the previous statement.

Complete answer:
A question tag is defined as a short question present at the end of a statement. A question tag converts a declarative/imperative statement into an interrogative statement. These tags are generally used to approve something or reassure a reply from the second person. Question tags are mainly formed using auxiliary verbs.
A question tag is similar to a reverse of the sentence. It starts with a verb and ends with a subject. Therefore, a question tag that in a positive statement is negative, and a question tag that in a negative statement is positive. The verb used is usually the same as used in the sentence.
‘Owns’ is the main verb in the above sentence. In this statement, the auxiliary is not present. The indirect auxiliary verbs are do, does, etc.
'Does' is implied in the above sentence, therefore the correct question tag is 'doesn't he?’
Option A 'Does he' is used in negative statements.
Option B, 'will he' is used when the verb used in the sentence is 'won't'.
Option D, 'is he' is used when the verb used in the sentence is 'isn't'.
Therefore, options A, B, and D are incorrect. The correct answer is option C.

Note:
In a sentence, subjects and verbs must agree with each other in number i.e. singular or plural. So, if in a sentence, a subject is singular, the verb used must also be singular and if a subject is a plural, the verb used must also be plural.