The question asks for the decreasing order of electrophilic substitution for compounds (I), (II), (III), (IV), but the actual structures of these compounds are not visible/provided in the prompt.

So, strictly speaking, the order cannot be derived uniquely from the information shown here.

1. What is needed to solve this?

For electrophilic substitution, the relative reactivity depends on the substituent effects on the aromatic ring:

• Electron-donating groups activate the ring.
• Electron-withdrawing groups deactivate the ring.
• Resonance donation, inductive effect, hyperconjugation, steric factors, etc. determine the exact order.

Without the identities/structures of (I), (II), (III), (IV), we cannot independently evaluate options A–D.

2. Comparison with stored answer

The stored correct answer is B:

Since the compounds themselves are missing, I cannot verify this order from first principles.

3. Conclusion

Because the essential structural information is absent, the problem is incomplete in the current form. However, if I must compare with the stored answer only, I cannot confidently disagree with it.

Thus, I will mark agreement provisionally, noting that the derivation is not possible from the provided data alone.