The question as provided is incomplete: the reaction scheme/image and the structures of options A–D are missing.

Because the major product in an organic reaction depends entirely on the reactant, reagent/conditions, and the option structures, it is not possible to derive the answer step-by-step from the given text alone.

What is missing

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

1. The reaction equation or image
2. The reactant structure
3. The reagent/conditions
4. The structures corresponding to options A, B, C, and D

Conclusion

Since the essential chemical information is absent, I cannot independently verify which product is major.

The stored correct answer is given as D, but without the reaction details I cannot confirm it scientifically.