Look at attachment:
So lets go through them:
A: the larger the log(Kc) the more positive the Kc value. Thus statement A is true
B: e.d.t.a has a higher Kc value so will displace 1,2-diaminoethane
C: this is just something we have to know. It is true
D: this is also true as all others are either monodentate/hexadentatde. This is true.
It would seem all answers are true. However, B is the answer. Why?