The question refers to “the following reaction” and asks for the major product, but the reaction scheme and the actual option structures for A, B, C, D are missing from the prompt.

So, the problem is incomplete: without the reactant/reagent/conditions and without the option structures, the major product cannot be determined.

Step-by-step analysis

1. To identify the major product in an organic reaction, we need:

   • the starting compound,
   • the reagent(s),
   • the reaction conditions,
   • and/or the structures of options A–D.

2. In the given prompt, only this is provided:

   • Subject: Chemistry
   • Topic: organic chemistry
   • Sub-topic: hydrocarbons
   • Type: MCQ
   • Stored correct answer: D

3. However, the essential chemical information is absent:

   • No reaction equation/image
   • No structures for options A, B, C, D

4. Therefore, a chemically valid determination of the product is not possible from the available data.

Conclusion

Because the reaction and options are missing, I cannot derive the correct product independently.

If you share the reaction scheme or the option structures, I can solve it step-by-step and verify whether D is correct.