The question image/structures are missing. The prompt says:

"The major product formed in the following reaction is:"

but the actual reaction scheme and the structures of options A, B, C, D are not provided in the text. Since this is an organic chemistry product-prediction problem, the answer depends entirely on the substrate, reagent/conditions, and the option structures.

What can be concluded?

Without the reaction and option structures, the major product cannot be derived logically from the given information.

Comparison with stored answer

The stored correct answer is D, but because the necessary chemical structures are absent, I cannot independently verify that choice.

What is needed to solve it

Please provide either:

1. the reaction image, or
2. the substrate, reagents, and conditions in text form, and
3. the structures corresponding to options A–D.

Then I can solve it step-by-step and verify whether D is correct.