The question refers to structures of $P$, $Q$, $R$, and options $A$–$D$, but in the provided prompt the actual structural diagrams are missing.

So, the key chemical information needed to solve the problem is unavailable:

1. The structure of $R$ is said to be “given below”, but it is not present.
2. The structures of options $A$, $B$, $C$, and $D$ are also not shown.

Without those structures, it is impossible to:

• determine what rearrangement $P \xrightarrow{H^+} Q$ undergoes,
• infer $Q$ from the ozonolysis/reflux-alkaline products,
• and match the valid starting structures among the options.

What would normally be done

If the structures were visible, the method would be:

1. Identify $Q$ from the given product $R$ using ozonolysis.
2. Since ozonolysis followed by alkaline reflux often cleaves alkenes to carbonyl compounds, then further transforms aldehydes under basic oxidative conditions, we would reconstruct the alkene $Q$.
3. Then we would check which candidate structures $P$ can undergo acid-catalyzed rearrangement to form that alkene or precursor $Q$.
4. Since this is MCQM, each option would be tested independently.

Conclusion

Because the actual molecular structures are missing from the prompt, the problem cannot be solved rigorously from the provided information alone.

However, the stored correct answer is given as A, D. Since I cannot independently verify it without the structures, I cannot honestly claim agreement based on derivation.