While recognizing that lying often facilitates social ineractions,psychiatrists are seeking to determine when they become destructive and which kinds of mental problems they can signal.

a.they become destructive and which kinds of mental problems they can signal
b.they become destructive and the mental problems that are signaled by them
c.it becomes destructive and what are the kinds of mental problems they signal
d.it becomes destructive and the mental problems that are signaled by it
e.it becomes destructive and which kinds of mental problems it can signal

Can somebody explain what's wrong with D. i eliminated D because it is written in passive voice and E was written active voice without any error. So i pick E over D. is that good enough reason ?

Thanks!