
Passage: The coach of a provincial go team selects four of the seven players E, F, G, H, J, K and M to participate in the professional league. The selection must meet the following conditions: one of E or F will participate, but not both. One of J or K participates, but not both. If J participates, G participates. M will not participate unless F participates.
Question: Which of the followings is impossible to participate in the competition together?
A. A.E and J.
B. B.E and M.
C. C.F and G.
D. D.F and J.
Answer: