Sn1 and Sn2 products are same with (excluding stereoisomers):

S_N1 and S_N2 products are same with (excluding stereoisomer):

(a) In S_N1 reaction, rearrangement of carbocation occurs, so it gives different product in S_N1 reaction than S_N2.

(b) The given halide is tertiary, so here S_N1 reaction is possible but S_N2 is not possible due to steric hindrance.

(c) Here secondary halide is given, it is easy for the compound to undergo S_N1 and S_N2 reaction at same rate.

(d) In S_N1 reaction, rearrangement of carbocations occurs, so it gives different product in S_N1 reaction than S_N2.

Hence, in option C, the same products are obtained in both S_N1 and S_N2 reaction.

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