How does the bedbug feed?

The bedbug is classified as a hematophagous insect, meaning it feeds exclusively on the blood of its hosts, which primarily includes humans. This feeding behavior is crucial for its survival and reproduction. During a typical feeding session, a bedbug will pierce the skin of its host using specialized mouthparts and then draw blood for several minutes, often causing mild irritation or allergic reactions in some individuals.

The other options describe feeding behaviors that do not apply to bedbugs. Plant sap is typically the food source for some other insects, while dead skin cells are not a significant nutritional source for them. Bedbugs also do not prey on other insects, as they are not carnivorous. Their dependence on human blood is what defines their role as pests in households, making option A the correct answer.