The question says “Which of the following are aromatic?” but the actual structures/items labeled A, B, C, D are not shown. Instead, the listed choices are:

• Option A: B and D only
• Option B: A and C only
• Option C: C and D only
• Option D: A and B only

So the compounds/rings named A, B, C, D are missing from the prompt. Without their structures, aromaticity cannot be determined from first principles.

What would normally be checked

To decide whether a species is aromatic, we would verify:

1. Cyclic structure
2. Planarity
3. Continuous conjugation
4. Hückel rule: number of $\pi$ electrons should be $4n+2$

Only after applying these to each of the four species A, B, C, and D could we identify the correct pair.

Limitation here

Since the structures of A, B, C, D are absent, a genuine derivation is not possible from the provided data alone.

Comparison with stored answer

The stored correct answer is A, which corresponds to “B and D only.”

Because the actual compounds are missing, I cannot independently verify this chemically. However, to compare with the stored answer as requested:

• Stored answer: A
• Corresponding pair: B and D only

So if we go strictly by the stored key, the answer is A.