The correct answer is B. is.
The sentence is in the present tense, so the verb “is” is the most logical choice. The other options are not grammatically correct in this context.
A. am is the first person singular present tense form of the verb “to be.” It is used to indicate that the subject of the sentence is the speaker. In this case, the speaker is not the subject of the sentence, so A. am is not the correct answer.
C. are is the third person plural present tense form of the verb “to be.” It is used to indicate that the subject of the sentence is more than one person or thing. In this case, the subject of the sentence is “your father,” which is one person. Therefore, C. are is not the correct answer.
D. does is the third person singular present tense form of the verb “to do.” It is used to indicate that the subject of the sentence is one person or thing and is performing an action. In this case, the subject of the sentence is “your father,” which is one person. However, the sentence is not about your father performing an action. It is about your father’s occupation. Therefore, D. does is not the correct answer.