The question image/text appears incomplete: it asks to identify compounds $[A]$, $[B]$, and $[C]$ in a reaction sequence, but the actual reaction sequence and the option contents are missing. The listed options are only

• A:
• B:
• C:
• D:

with no structures or descriptions.

Why the problem cannot be solved as given

To identify $[A]$, $[B]$, and $[C]$, I need at least one of the following:

1. The full reaction scheme showing starting material and reagents/products, or
2. The actual answer choices containing the structures/names.

Without that information, there is no chemical basis to determine the correct option.

Conclusion

Because the crucial reaction sequence is absent, the answer cannot be derived reliably from the provided text alone. Therefore, I cannot validly confirm the stored answer $\text{C}$.

If you share the missing reaction scheme or the option structures, I can solve it step-by-step and verify the correct answer properly.