Which of the Following Do Researchers Suspect Is an Important

Which of the following do researchers suspect is an important factor in colony collapse disorder (CCD?)

A) Habitat fragmentation caused by land development inhibits a bee's chance of finding a reproductive partner.
B) Long-term exposure to low levels of insecticides impair a plant's ability to produce nectar that a bee can use.
C) Exposure to extremely high levels of herbicides can kill an entire population of plants and the bees that depend on them.
D) Herbicides kill the plants that bees pollinate thereby eliminating the source of nectar for a bee.
E) Long-term exposure to low levels of insecticides impair a bee's ability to navigate and communicate.