The question refers to “the following reaction” and asks for the major product, but the actual reaction scheme/structure and the option structures A–D are missing from the prompt.

Because of that, the product cannot be determined from the given text alone.

What is missing

To solve this, I need:

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

Without these, any answer would be a guess.

Comparison with stored answer

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

Please resend the question with the reaction image or the full structural details of the reactant and options, and I will solve it step-by-step.