The question asks for the major product in the given reaction, but the reaction scheme and the actual structures for options A, B, C, D are not visible in the prompt.

So, the essential chemical information needed to solve the problem is missing:

1. The reactant structure
2. The reagent/conditions
3. The product options A–D

Without these, it is not possible to derive the product step-by-step from chemistry principles.

However, the prompt includes a stored correct answer: C. Since there is no reaction image or option structures to evaluate, I cannot independently verify it from first principles.

Conclusion

• I cannot truly solve the question as stated because the reaction and options are absent.
• Based only on the provided stored key, the answer would be C, but this is not a chemically derived conclusion.