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

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

Step-by-step assessment

1. To identify the major product in an organic reaction, we need:

   • the starting compound,
   • the reagents/conditions, and
   • the structures of the options.

2. In the current prompt, all of these are absent:

   • no reaction is shown,
   • options A, B, C, D are blank,
   • only the stored answer is given as B.

3. Therefore, a chemistry-based derivation of the product is not possible from the supplied data.

Comparison with stored answer

Since the actual reaction and choices are missing, I cannot independently verify whether B is correct.

So I must disagree with verification, not because B is necessarily wrong, but because there is insufficient information to solve the problem properly.