The question asks for the order of reactivity of the given chlorides with acetate in acetic acid, but the actual structures corresponding to options A, B, C, and D are missing from the prompt.

Without the structures of the chlorides, the order of reactivity cannot be determined uniquely, because the answer depends on factors such as:

1. Whether the chloride is alkyl, allylic, benzylic, vinylic, or aryl
2. Degree of substitution: primary, secondary, tertiary
3. Possibility of resonance stabilization of carbocation
4. Whether the reaction proceeds via $S_N1$ or $S_N2$ in acetic acid/acetate medium
5. Steric hindrance

General principle

In acetic acid with acetate ion, the medium is polar protic and weakly nucleophilic, so substrates that can react by $S_N1$ are often more reactive. Typical trend is:

Also,

• Benzylic and allylic chlorides are highly reactive due to resonance stabilization.
• Aryl chlorides and vinyl chlorides are very unreactive toward nucleophilic substitution under ordinary conditions.

Why the problem cannot be solved fully

Since the structures for options A, B, C, and D are absent, I cannot:

• identify the substrates,
• compare their mechanisms,
• or derive the exact order.

Therefore, the stored correct answer D cannot be verified from the information provided.

What is needed

Please provide the image or names/structures of the chlorides in options A–D. Then I can determine the exact reactivity order step-by-step and compare it properly with the stored answer.