The question refers to “the following reaction sequence” and asks for the major product $[C]$, but the actual reaction scheme/structures of reactant, intermediates, reagents, and the option structures A–D are missing from the prompt.

Because of that, the product cannot be determined uniquely.

Step 1: Identify missing information

To solve such a question, we must know:

1. The starting compound
2. The reagents/conditions in each step of the sequence
3. The structures corresponding to options A, B, C, and D

Here, none of these structural details are visible in the text provided.

Step 2: Can we infer the answer from topic alone?

No. The topic is aldehydes, ketones and carboxylic acids, but many different reaction sequences are possible in this chapter, so the major product cannot be deduced reliably without the missing scheme.

Step 3: Comparison with stored answer

The stored correct answer is B, but since the reaction sequence and options are absent, there is not enough information to independently verify whether option B is correct.

Therefore, I cannot honestly derive the answer from the given data.

If you upload or type the reaction sequence image and option structures, I can solve it step-by-step and verify whether B is correct.