The question asks for the major product of a reaction, but the actual reaction scheme/image is missing, and the options A–D are also blank.

So, the problem as provided is incomplete. Without the substrate, reagent, or product options, the major product cannot be determined.

What is missing

To solve this, I would need at least one of the following:

1. The reaction equation or structure of the reactant(s)
2. The reagents/conditions
3. The structures corresponding to options A, B, C, D

Conclusion

Because the reaction itself is not visible in the prompt, I cannot independently derive the major product.

Since the stored correct answer is D, but there is no chemical information available to verify it, I cannot honestly confirm that choice from the given data.