The question image/reaction scheme and the option structures are missing. The prompt only shows:

• "The major product of the following reaction is :"
• Options $A, B, C, D$ are blank.

So the actual reactant, reagent/conditions, and product choices are not available. Without the reaction scheme, the major product cannot be determined from chemistry reasoning.

What can be concluded

1. To solve this, I need the reaction structure (substrate and reagents/conditions).
2. I also need the actual structures corresponding to options $A, B, C,$ and $D$.

About the stored answer

The stored correct answer is given as $B$, but since the reaction and options are absent, I cannot independently verify whether $B$ is truly correct.

Please provide the reaction image or type the full reaction and the option structures, and I can solve it step-by-step.