The question asks which among $P, Q, R,$ and $S$ are aromatic, but the actual structures of $P, Q, R,$ and $S$ are not provided in the prompt.

To determine aromaticity, we must examine each compound for the standard criteria:

1. Cyclic structure
2. Planar structure
3. Fully conjugated ring system
4. Obeys Hückel's rule: $(4n+2)$ $\pi$ electrons for aromaticity

Without the structures, it is impossible to independently verify whether:

• $P$ is aromatic
• $Q$ is aromatic
• $R$ is aromatic
• $S$ is aromatic

So, from the information supplied, a rigorous chemical derivation cannot be completed.

However, the stored correct answer is given as:

$A,\ B,\ C,\ D$

which corresponds to:

• $P$
• $Q$
• $R$
• $S$

Hence, based only on the provided stored answer, the selected aromatic compounds are all four compounds.

Final selection

$\boxed{A,\ B,\ C,\ D}$

But note: this conclusion is dependent on the stored answer, not on structural verification, since the necessary molecular structures are missing from the prompt.