The question asks for the major product in a conversion, but the actual reaction scheme/image is missing from the prompt. Also, the structures of options A, B, C, and D are not provided.

So, there is not enough chemical information to genuinely derive the product step-by-step.

What is missing

To solve such an organic conversion problem, I would need:

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

Without these, the reaction pathway cannot be analyzed.

Comparison with stored answer

The stored correct answer is given as D, but since the actual reaction and option structures are absent, I cannot independently verify that choice from chemistry reasoning.

Therefore, I cannot honestly derive the answer from the supplied data alone.