There is no passage and answer choices, so it is impossible to answer this question. I apologise.
Every sister's point of view is different. An older sister might think maturely while a younger sibling might think more naive or immaturely.
Answer:
The significance of Jack's mask in chapter 4 of Lord of the Flies is that it allows him to feel liberated from "shame and self-consciousness" as he embraces his savage nature without guilt or embarrassment. Hidden behind his clay mask, Jack is free to behave like a primitive, bloodthirsty savage.
