The question refers to an "above reaction sequence", but the actual reaction scheme and the structures of options A, B, C, D are missing in the prompt.

So, there is not enough chemical information to determine product C rigorously.

What is missing

To solve such a question, I would need at least one of the following:

1. The full reaction sequence (starting compound, reagents, intermediates).
2. The structures corresponding to options A, B, C, D.
3. An image of the reaction scheme.

Why the answer cannot be derived

In organic chemistry, especially in the chapter aldehydes, ketones and carboxylic acids, product prediction depends critically on:

• nature of the substrate,
• reagent order,
• oxidation/reduction conditions,
• rearrangements or protection/deprotection steps.

Since none of these are visible here, any answer would be only a guess.

Comparison with stored answer

The stored correct answer is D, but because the reaction scheme is absent, I cannot independently verify it.

Therefore, I do not confidently agree with the stored answer based on the provided data alone.