Identify the segment in the sentence which contains a grammatical error.
This is only mistake he has made in the dictation.

Correct option is B

Option (b) "only mistake" contains a grammatical error.

• Explanation: The sentence is missing the article "the" before "only mistake." It should be "the only mistake" to correctly indicate that it is the single mistake made.

• Correct Sentence: This is the only mistake he has made in the dictation.

• Grammatical Rule Used: Articles (a, an, the) are used to modify nouns, and "the" is used to specify something definite or unique.

• Example: She found the only key that opened the door.