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Question:

Four friends, A, B, C and D got the top four ranks in a competitive examination, but A did not get the first, B did not get the second, C did not get the third, and D did not get the fourth rank. Who secured which rank?

A. Neither A nor D were among the first 2.
B. Neither B nor C was third or fourth.

Explanation:

From statement A, 

Neither A nor D were among the first 2 which means that D gets either 3^rd or the 4^th rank.

∵ D did not get the 4^th rank.

∴ D gets the 3^rd rank and A gets the 4^th rank.

∵ B didn’t get the 2^nd rank.

∴ B gets the 1^st rank and C gets the 2^nd rank.

∴ Statement A alone is sufficient.

From statement B,

B gets either the 1^st or the 2^nd rank.

We know that B did not get the 2^nd rank.

∴ B gets the 1^st rank and C gets the 2^nd rank.

∵ D didn’t get the 4^th rank.

∴ D gets the 3^rd rank and A gets 4^th rank.

∴ Statement B alone is sufficient.

∴ The question can be answered using either statements alone.

Hence, option (c).