Which of the following is closest in meaning to "impervious"？ （Paragraph 6)A．unaffected （b

Which of the following is closest in meaning to "impervious"？ (Paragraph 6)

A．unaffected (by)

B．caused (by)

C．stimulated (by)

D．explained (by)

请帮忙给出正确答案和分析，谢谢！