Final answer:
Row covers are the prevention method used for the spotted cucumber beetle, acting as a physical barrier to protect plants. Ladybugs and lacewings are beneficial predators for some pests but are not specifically used for spotted cucumber beetles. Targeted pesticide use is also an option to protect predator species and minimize environmental damage.
Step-by-step explanation:
The prevention method used for the spotted cucumber beetle mentioned in the given options is a) Row covers. Row covers are a physical barrier that prevent beetles and other pests from reaching the plants. Other methods not listed in the options but also applicable to pest prevention could include the use of pest resistant cultivars or specific agricultural practices such as intercropping to discourage pest infestations. Although insect predators like ladybugs and lacewings are beneficial for controlling certain kinds of pests, they are not specifically used for spotted cucumber beetle control. When pesticides are necessary, targeted application on specific plant parts rather than whole-field spraying is preferred to protect natural predator species and reduce overall environmental impact.