Ok so please don't completely trust my answer as i might not know what im talking about.
Piggy's death in TLOTF as well as the destruction of the conch is hugely significant as it symbolizes the death of a voice of reason. Throughout the book piggy took the practical side to things. Often siting the most logical ways and solutions to problems while the conch acted as a cornerstone of control. It was there to keep order and reason.
The answer is D.
Obedient as it is an adjective
Yes, the answer is "Unsociable" got it right for apex
The answer is grendals father. It's definitly not the dragon because he fought it and died.