Raising young children who crawl about the floor, a mother does not want to spray chemicals in or ...

Raising young children who crawl about the floor, a mother does not want to spray chemicals in or around the home. However, she is aware of West Nile virus spread by mosquitoes and Lyme disease spread by ticks. Therefore, she decides to develop a different strategy. Carefully examining and repairing the window screens, window enclosures, and doorways, she closes up any cracks or tears where bugs might get in. This mother is protecting her children by using
A) cultural control.
B) natural enemies control.
C) genetic control.
D) natural chemical control.