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In addition to the given information, if it is further known that B is sitting on the last bench, then which of the following pairs must be sitting together ?

  • A.A and G
  • B.C and D
  • C.A and H
  • D.C and E

Answer: C

The pair that must sit together is A and H.

B and H are on benches 1 and 4, one on each. If B is on the last bench, H must be on bench 1, which is A's bench, so A and H sit together.

A and G are on benches 1 and 4 and are never together. C sits with D only if C is on bench 2, which is not forced, since E could take that seat. C and E are never on the same bench, by the given conditions.

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