Final answer:
The most true statement about Australian cockroaches is that they are the most prevalent outdoor roach in South Florida. They prefer outdoor environments and can be identified by yellow stripes on their body. They are not the most common indoor roach and are smaller than the American cockroach.
Step-by-step explanation:
The statement that is most true regarding Australian cockroaches is a) most prevalent outdoor roach in South Florida.
The Australian cockroach, Periplaneta australasiae, is often found in outdoor environments, particularly in warm, humid climates such as South Florida. They are known to thrive in gardens, around trees and shrubs, and in greenhouses - places where they can feed on plant material. While they can occasionally venture indoors, they are not considered the most prevalent indoor roach. In contrast, the American cockroach, Periplaneta americana, is typically larger and more commonly found in sewers and indoor environments.
It's important to note that the Australian cockroach is usually mistaken for other species due to similar appearances, but it can be distinguished by the yellow stripes on the edges of its body and by its behavior and preferred habitats.