A team must include 4 from {J,K,L,M,N,O,P}. If J is in, K is out. If L is in, M is in. If N is out, O is in. J and L are both in. Who must be on the team?

✓ Correct Answer: Option D

J in → K out. L in → M in. So J, L, M are in (3). Need 1 more from {N,O,P} (K is out). If N is out → O must be in. So either N is in, or O is in, or P is in. Any of N/O/P works (with the N→O constraint noted).