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: "It is easy to see that a lawyer's demeanour in court may be prejudicial against the interests of his client." Let's break it down to identify any grammatical error:

1. Option A - It is easy to see that:
   • This part is grammatically correct. "It is easy to see that" is a proper introductory phrase and is clear in meaning.
2. Option B - a lawyer's demeanour in court:
   • This part is grammatically correct. The phrase "a lawyer's demeanour in court" is properly structured and conveys the intended meaning.
3. Option C - may be prejudicial against the interests of his client:
   • This part contains an error. The preposition "against" is incorrectly used. The correct preposition here is "to" instead of "against." We say something is "prejudicial to the interests of someone," not "prejudicial against." Therefore, it should be "may be prejudicial to the interests of his client."
4. Option D - No error:
   • There is an error in Option C with the incorrect use of "against." Therefore, Option D is not correct.
5. Final Answer:
   • The error is in Option C. The correct answer is C.