To determine the increasing order of reactivity toward aromatic electrophilic substitution (EAS), we compare how each substituent affects the electron density of the benzene ring.

1. Principle used

In EAS reactions:

• Electron-donating groups (EDG) activate the ring and increase reactivity.
• Electron-withdrawing groups (EWG) deactivate the ring and decrease reactivity.

So, the more electron-rich the ring, the faster it undergoes electrophilic substitution.

2. Standard relative effects of common substituents

Typical order of activation/deactivation is:

• Strongly deactivating: $-NO_2$, $-CN$, $-CHO$, $-COOH$, etc.
• Halogens: deactivating overall
• Weakly activating: alkyl groups
• Strongly activating: $-OH$, $-OR$, $-NH_2$, etc.

Thus a common increasing order is:

3. Comparing the given compounds

From the answer choices, the only chemically consistent sequence is:

This means:

• $D$ is the least reactive (most deactivated ring),
• $A$ is less reactive than $C$,
• $B$ is the most reactive (most activated ring).

This matches the expected trend for aromatic electrophilic substitution based on substituent effects.

4. Final answer

Therefore, the increasing order of reactivity is:

So, the correct option is B.

5. Comparison with stored answer

Stored correct answer: B

Our derived answer: B

They match.