Read each sentence to find out whether there is any grammatical error in it. The error, if any will be in one part of the sentence. The letter of that part is the answer. If there is no error, the answer is 'D'. (Ignore the errors of punctuation, if any). (solve as per the direction given)

The sentence reads: "Neither he nor his father is interested in joining the party." Let's break it down to identify any grammatical error:

1. Option A - Neither he:
   • This part is grammatically correct. "Neither" is correctly used with the subject "he," and there is no error here.
2. Option B - nor his father is interested:
   • This part also has no issue, but it is important to note that when "neither...nor" is used, the verb should agree with the noun closest to it. In this case, "his father" is the closest subject, which is singular, so the singular verb "is" is correct.
3. Option C - in joining the party:
   • This part is grammatically correct. "In joining the party" is a proper prepositional phrase that fits well with the rest of the sentence.
4. Option D - No error:
   • There is no error in any part of the sentence. It is grammatically correct.
5. Final Answer:
   • The sentence is free of errors, so the correct answer is D. No error.