The question refers to a reaction scheme and options, but the actual reaction image/structure and the option structures A–D are missing from the prompt.

Because of that, the major product cannot be determined from the given text alone.

What is needed

To solve this organic chemistry question, I need:

1. The substrate/reactant structure
2. The reagent(s) and conditions
3. The structures corresponding to options A, B, C, and D

Why I cannot verify the stored answer

Without the reaction and option structures, there is no chemically meaningful way to:

• identify the mechanism,
• predict rearrangement/substitution/elimination,
• compare products,
• or confirm whether option A is correct.

So the stored answer cannot be reliably checked from the information provided.

Please provide

Please upload or type the missing reaction scheme and option structures, and I will solve it step-by-step and compare the result with the stored answer.