MCQ Question

A five-member research group is chosen from engineers I, J, K and L and chemists M, N, O and P. At least three engineers must be in the research group. However, I refuses to work with L, J refuses to work with M, N refuses to work with O, L refuses to work with N. If J and K are chosen, which is necessarily true? I. I is chosen II. L is chosen III. Either N or O is chosen