The question refers to “the following reaction” and asks for the major product, but the actual reaction scheme/structure is missing from the prompt. Also, the options A, B, C, D are blank, so there is no chemical information available to evaluate.

Because of this, a valid organic chemistry solution cannot be derived from the provided data.

What is missing

To determine the major product, I would need at least one of the following:

1. The substrate/reactant structure
2. The reagents and conditions
3. The product options A–D
4. Ideally, the reaction image if this was originally diagram-based

Conclusion

With the current information, the answer cannot be solved uniquely.

Since the stored correct answer is given as B, but there is no reaction or option content to verify it, I cannot confidently agree with the stored answer on chemical grounds.