A) A Problem is NP Complete Means, It is NP Hard & Belongs To NP. L Is NP Complete, it belongs to NP so correct.
B) NP Complete is as hard as every other problem in NP. As P is subset of NP (Every P Problem is NP) B Is correct.
C) This is correct, NP Complete = As hard as all other NP Problems. All can be reduces to it.
D) Hamilton cyle is NP Complete, so This is correct.
E) This created contradiction. If P != NP Then NP Complete problem can not belong to P.