Question

a good example of where biological control has worked with at least some success is the ______.
a. japanese beetle
b. colorado potato beetle
c. gypsy moth
d. all of the above

Explanation:

Biological control has been applied to Japanese beetle, Colorado potato beetle, and gypsy moth with varying degrees of success. So the correct option is d as it includes all the mentioned cases.

Answer:

d. all of the above