Which type of insect includes beneficial species like the damselfly and damsel bug?

The correct answer is B, as Odonata is the order that includes insects such as dragonflies and damselflies. These insects are known for their predatory habits, feeding on various pests like mosquitoes and flies, which makes them beneficial for controlling insect populations. The presence of damselflies in ecosystems is an indicator of good water quality, as they thrive in clean aquatic environments.

In contrast, while insects in the order Hemiptera, which includes true bugs, may have some beneficial species, they also include many pests that can harm plants and crops. Coleoptera, which encompasses beetles, includes both beneficial and harmful species but does not feature damselflies or damsel bugs. Similarly, Diptera consists of flies, which often include many pests, such as houseflies and fruit flies, making them less advantageous in agricultural settings. Therefore, Odonata stands out as the group associated with notably beneficial species like damselflies and damsel bugs.