First think about what each word means.
Impermeable- means impossible to permeate( penetrate/ go through)
Introverted- means characterized by interest in or preoccupation with oneself or one's own
thoughts as opposed to others or the environment; shy or reserved.
Perennial- means a looong time
Subversive- means intending or intended to subvert an established order, especially to undermine or overthrow an established government.
Second think about which one makes the most sense
The answer therefore in my opinion is C.
Hope that helps :0)
