The question refers to a sequence of reactions and asks for the major product $P$, but the actual reaction scheme/structures and the option structures A, B, C, D are missing from the prompt.

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

What is missing

To solve such an organic chemistry question, I would need:

1. The starting compound structure
2. The reagents/conditions in sequence
3. The structures corresponding to options A, B, C, and D

Without these, it is impossible to determine the major product unambiguously.

Conclusion

Since the reaction pathway and options are absent, I cannot independently verify whether option B is correct.