The question refers to an “above reaction”, but the actual reaction scheme/image is not present in the prompt. So the substrate, reagent, and the identities of compounds A and B are missing.

Without the reaction scheme, it is impossible to rigorously determine:

1. whether the reaction is possible in acidic medium,
2. whether products $A$ and $B$ are formed equally,
3. which of $A$ or $B$ is the major product.

What can be concluded?

Since the chemical structures are absent, the problem is underdetermined from the given text alone. A valid step-by-step organic mechanism analysis requires the missing reaction diagram.

Comparison with stored answer

The stored correct answer is C: “Compound $A$ will be the major product.”

However, because the reaction itself is missing, I cannot independently verify this from the provided information.

So, I must conclude that the answer cannot be derived reliably from the prompt as given.