Why Would Re-Treatment Not Be Necessary When Using Permethrin for Lice

Why would re-treatment not be necessary when using permethrin for lice treatment?

A) It causes lice to become infertile;therefore,they cannot lay new eggs.
B) It changes the pH of the scalp so that the environmental conditions for the lice are unfavorable and they leave.
C) It leaves a residue behind that is able to destroy any new eggs and nymphs.
D) Because treatment involves shaving the hair,re-treatment is unnecessary because the lice will not have a place to nest.

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