A) Permethrin is used to kill lice; individual lice change in order to survive exposure to permethrin; most lice become resistant to permethrin.
B) Louse populations become more common in schoolchildren; some lice are resistant to permethrin; permethrin is used to kill lice; lice resistant to permethrin become the most common type.
C) A louse population evolves resistance to permethrin; permethrin is used to kill lice; lice become more common in schoolchildren.
D) Permethrin resistance is common is lice; permethrin is used to kill lice; most lice become sensitive to permethrin.
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