The question asks for the major product of a reaction, but the crucial reaction scheme and the structures of options A, B, C, D are not visible in the provided prompt.

Because the substrate/reagents/products are missing, the reaction cannot be analyzed chemically in a valid step-by-step way.

What is missing

To determine the major product, I need:

1. The starting compound
2. The reagent(s)/conditions
3. The structures for options A–D

Without these, it is impossible to:

• identify the reaction type,
• track functional group transformations,
• compare possible products,
• verify whether option B is actually correct.

Comparison with stored answer

The stored correct answer is B, but since the reaction image/options are absent, I cannot independently derive that answer.

Please upload or type the reaction scheme and the option structures so I can solve it properly step-by-step.