The question refers to “the following reaction” and shows options $A$–$D$, but the actual reaction scheme and option structures are missing from the prompt.

So, with the information provided, the major product cannot be derived logically.

What is missing

To solve this organic chemistry product question, I would need:

1. The starting compound
2. The reagent(s)/conditions
3. The structures of options A, B, C, D

Without these, no valid step-by-step mechanism or product prediction can be made.

Comparison with stored answer

The stored correct answer is given as C, but since the actual reaction and options are absent, I cannot independently verify whether $C$ is correct.

Hence, I must disagree with verification, not because $C$ is necessarily wrong, but because the problem statement is incomplete.