17 studies have offered several possible reason that bees are vanishing. One reason that is often cited is the use of pesticides called neonicotionids, which are absorbed by plants and linger much longer than do topical pesticides. 18 Chemicals such as herbicides and fungicides may also play a role, contaminating the pollen that bees typically feed on and inhibiting healthy insect maturation.
Given the role that honeybees play in may explain why bees are vanishing. agriculture, the impact of this loss of hives on fruit, vegetable, seed, and nut crops 19 is not be scoffed at. A reduction in bee numbers leads to less pollination, which in turn leads to smaller harvests and higher food prices. Some farmers have resorted to renting hives from beekeepers to pollinate their 20 crops; when there is a shortage of bees this being an expensive proposition. Other farmers have increased 21 they’re dependence on costly hand-pollination by human worker. Furthermore, there may be sociological repercussions. Agroecologist AlexandraMaria Klein has suggested that rising produce prices could lead to an increase in obesity as people turn to cheaper, less wholesome fare.
For #17, which choice most smoothly and effectively introduces the writer’s discussion of studies of CCD in this paragraph?