For the trait of color in these beetles, where brown (B) is dominant to green (g),

B is the correct answers

Explanation:

75% brown and 25% green

Pesticide resistance at a population level, as opposed to just a few individual pests within a species, can occur after repeated exposure to a single type of pesticide. ... When a resistant population occurs, the pesticide is no longer useful for managing that specific pest and other management options must be sought out.