I think it is D.
'It' makes the sentence unclear in purpose
Answer:
Have not
Explanation:
Have not combines to become haven't. For example, I have not ate food today you can also say I haven't ate food today.
Answer:
He examines the possibility of various animals on the island and decides that there is no beast.
Explanation:
Piggy attempts to solve the identity of the beast pragmatically. He mentions that "life is scientific" and concludes that the only thing the boys should possibly fear is each other. Piggy is intelligent and continues to solve problems logically. He examines the possibility of various animals on the island and decides that there is no beast.
There's no excerpt to infer from