If A and C are members, the other members of the team cannot be :
Answer: D
Correct answer: P Q E
A brings S with it and C brings E, so S and E must both be among the other three members whenever A and C are in the team. That leaves just one free place. P Q E supplies E but not S, so A would sit in the team without S - which the rules forbid. The other three sets all contain both E and S and are therefore possible.
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