I don't understand how (C) is wrong. I also don't see how (D) is wrong. Either J or L have to be on stage so (D) cannot be true. I think that this rule also makes (A) & (B) correct choices too. Furthermore, "If Felipe is off stage, Jaclyn is also off stage." which gives us the contrapositive: If Jacklyn is on stage, Felipe is also on stage, so (B) cannot be true either.
What am I missing?