Key idea: electrophilic substitution in aromatic compounds
The rate of electrophilic substitution depends on how strongly the substituent already present on the benzene ring activates or deactivates the ring.

General order of activating/deactivating effects

• Groups donating electron density by resonance or hyperconjugation increase reactivity.
• Electron-withdrawing groups decrease reactivity.

Typical trend: $-OH, -OR > -R > H > -X > -NO_2, -CHO, -COOH \,\text{etc.}$

Identification of the compounds
From the given options/order pattern, the compounds correspond to relative activating/deactivating strengths such that:

• B is the most activating,
• A is next,
• C is less reactive than A,
• D is the least reactive.

Thus the correct reactivity order is $B > A > C > D$

Match with options
This corresponds to Option B.

Comparison with stored correct answer
Stored correct answer = B
Derived answer = B
Hence, they agree.