The question image/reaction scheme and the actual option structures are missing. Only the text

"The major product of the following reaction is"

is provided, but the reactant, reagents/conditions, and options $A$–$D$ are blank.

Therefore, the product cannot be determined from the given information.

What is needed to solve

To identify the major product, I need:

1. The starting compound
2. The reagent(s) / condition(s)
3. The structures of options $A, B, C, D$

Conclusion

Since the essential reaction data is absent, the answer cannot be derived reliably. Hence I cannot validly confirm option $A$ from chemistry reasoning alone.