The question refers to a set of reactions and asks for the major products A and B, but the actual reaction scheme/image and option structures are missing in the provided prompt. The options are listed only as:

• A:
• B:
• C:
• D:

with no chemical structures shown.

Because of this, it is not possible to derive the products or evaluate which option is correct from the given information alone.

What is missing?

To solve this, I need:

1. The reaction sequence (starting compound and reagents/conditions), and
2. The structures corresponding to options A, B, C, D.

Without these, no valid organic-chemistry deduction can be made.

Comparison with stored answer

The stored correct answer is B, but since the actual reaction scheme and options are absent, I cannot verify whether B is correct.