The question image/reaction scheme and the actual structures of options $A$–$D$ are missing from the prompt. Because of that, the reaction cannot be analyzed chemically from the given information alone.

What is needed to solve it

To determine the major product in an organic reaction, I need:

1. The reactant structure(s)
2. The reagent(s)/conditions
3. The structures corresponding to options $A$, $B$, $C$, and $D$

Without these, no step-by-step mechanism or product prediction can be carried out reliably.

Comparison with stored answer

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

Please upload or type the complete reaction scheme and the option structures, and I will solve it step-by-step.