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: "At the end of the year, every student who had done adequate work was automatically promoted." Let's break it down to identify any grammatical error:

1. Option A - At the end of the year:
   • This part of the sentence is grammatically correct. The prepositional phrase "At the end of the year" is properly structured and fits the sentence well.
2. Option B - every student who had done adequate work:
   • This part is also correct. "Every student" is a singular subject, and the relative clause "who had done adequate work" is appropriately used to modify it.
3. Option C - was automatically promoted:
   • This part is grammatically correct. The verb "was" correctly agrees with the singular subject "every student."
4. Option D - No error:
   • There are no grammatical errors in any part of the sentence. The sentence is correctly structured and conveys the intended meaning clearly.
5. Final Answer:
   • The sentence is free of errors, so the correct answer is D. No error.