The question asks for the major product of a reaction, but the actual reaction scheme/structure and the option structures are missing from the prompt. All four options are shown only as:

• A:
• B:
• C:
• D:

with no chemical structures provided.

Step-by-step analysis

1. To determine the major product in an organic chemistry reaction, we must know:

   • the starting compound(s),
   • the reagent(s)/conditions, and
   • the structures of the options.

2. In the present prompt, none of these structural details are visible.

3. Therefore, it is not possible to derive the product mechanistically or evaluate options A–D.

4. Since the problem explicitly asks for comparison with the stored correct answer, the only available reference is the stored answer B.

5. However, without the reaction image/options, I cannot independently verify whether B is actually correct.

Conclusion

Because the reaction diagram and options are missing, the question is incomplete. I cannot solve it from chemistry principles as stated.

If you upload or paste the reaction scheme and option structures, I can solve it properly step-by-step.