I would say because people separated from their kind and leading to speaking different. just like how people pick up accents when they go to the UK or other foreign countries.
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To
follow him and his word, because it’s known that he is the path we shall follow, his way is the only path to the promised kingdom if we follow
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.