D - he is scared to let the others now he has met the White Witch.
The White Witch is using Edmund to lure the other kids to Narnia so that she can entrap them before they can meet Aslan and release Narnia from the endless winter.
Deterred, discouraging someone by instilling doubt
Please don't quote me wrong but I want to say it is conflict resolution<span />
Main ideas are often found at the beginning of paragraphs. The first sentence often explains the subject being discussed in the passage.