The question refers to “the following reaction” and asks for the major product, but the actual reaction scheme/structures and the option structures A, B, C, 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 organic chemistry MCQ, I need:

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

Without these, there is no valid way to derive the major product step-by-step.

Comparison with stored answer

The stored correct answer is given as B, but since the actual reaction and options are not visible, I cannot independently verify whether B is correct.

Please resend the question with the reaction image or the full structures of the reactants and options.