Which type of cockroach prefers higher moisture levels?

The Oriental cockroach is known for its preference for higher moisture levels compared to other cockroach species. This preference makes it commonly found in damp, humid environments such as basements, sewers, and under sinks. Unlike the German cockroach, which can thrive in all types of environments but is often found in kitchens and bathrooms where food and moisture are easily accessible, the Oriental cockroach's habitat is more specifically linked to areas with excess moisture.

The American cockroach, while adaptable, tends to prefer warmer climates and can often be found in sewers and drains, but it does not have the same moisture dependency as the Oriental cockroach. The Brown-banded cockroach, on the other hand, usually prefers drier environments found in higher locations within buildings and is less associated with moisture levels.

Thus, the clear identification of the Oriental cockroach as the species that predominantly thrives in moist conditions clarifies its ecological niche and behavior, confirming its selection as the correct answer.