The question statement is incomplete: it says "Consider the following reactions 'A' is :" but the actual reaction scheme and the four options are missing.

Because of that, the compound/product/intermediate 'A' cannot be determined from the provided information.

What is missing?

To solve this, I would need at least one of the following:

1. The reaction sequence or reaction scheme
2. The structures/reagents/conditions
3. The actual option contents for A, B, C, D

Without these, no valid chemical deduction can be made.

Conclusion

Since the reaction details and options are absent, the answer cannot be derived from the given data.