In the sentence He is not agreeing to me identify the part that contains a grammatical error.

Introduction / Context:
This item is a classic error spotting question. A sentence is divided into parts, and the learner must decide which part, if any, contains a grammatical or usage error. The sentence given is “He is not agreeing to me.” At first glance, the tense and auxiliary verb may look acceptable, but the correct preposition and natural expression in English are the key points being tested here.

Given Data / Assumptions:

• The full sentence is “He is not agreeing to me.”
• Part A: He is.
• Part B: Not agreeing.
• Part C: To me.
• Part D: No error, which is selected only if the entire sentence is correct.

Concept / Approach:
In English, the usual verb phrase is “agree with someone” rather than “agree to someone.” We say “He agrees with me” when we mean that his opinion matches ours. The phrase “agree to” is used with things like proposals or conditions, as in “agree to the plan.” Therefore, the problem lies not in the continuous aspect or the negative, but in the preposition that follows the verb agree. We must identify the segment that includes the incorrect preposition.

Step-by-Step Solution:
Step 1: Check part A, “He is.” This subject and auxiliary verb combination is grammatically normal and does not cause the error. Step 2: Examine part B, “Not agreeing.” Present continuous negative form is acceptable in many contexts, for example “He is not agreeing with the suggestion.” Step 3: Look at part C, “To me.” This is where the wrong preposition appears. It should be “with me” when we discuss agreement in opinion. Step 4: Combine the corrected parts to form “He is not agreeing with me,” which is grammatical and natural.

Verification / Alternative check:
We verify by testing other sentences using the same verb. Common phrases are “I agree with you,” “They agreed with us,” and “We do not agree with them.” Whenever agreement refers to people and their opinions, the correct pattern is agree with person. The usage agree to is reserved for things such as “agree to the terms” or “agree to the request,” where the object is not a person but a proposal or condition. This confirms that the wrong segment is the one containing “to me.”

Why Other Options Are Wrong:

• Part A: “He is” is a correct subject and auxiliary combination.
• Part B: “Not agreeing” is a valid participle phrase as part of present continuous, so it is acceptable.
• Part D: No error is wrong because we have already identified an incorrect preposition in part C.

Common Pitfalls:
A frequent mistake is to feel that continuous tense of agree is awkward and therefore blame “is not agreeing.” While certain stative verbs rarely use continuous forms, in modern English “is agreeing” can occur in spoken contexts. The clearer and more testable error here is the wrong preposition. Always check verb plus preposition collocations carefully in such questions.

Final Answer:
The error is in part To me. because the correct expression should be “He is not agreeing with me.”