I want to get the solution for this

Dear student ,
The correct option is (c) 
Reason :   in option (a) it has double bond character  due to + M effect 
        In (d) it is 3 0 in nature which does not show SN- 2 reaction 
       In  (b)  and (c) both are 10 , thus show SN -2 Reaction but ( C) will be more faster than (b) as iy has Br group which has high leaving nature this is due to larger size of Br 
Regards

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