What is the size of adult German cockroaches?

The correct choice regarding the size of adult German cockroaches is that they typically measure between 1 to 2 inches in length. Adult German cockroaches, which are one of the most common types found in households, usually have a distinctive brown or tan color with two dark stripes on their backs.

Contestants may confuse them with other smaller cockroach species; it's important to note that adult German cockroaches do exceed the measurement given in the choice of less than 0.5 inches. They are generally larger and are not classified as "small" cockroaches. The choice regarding 1 to 2 inches accurately reflects the actual size range, making it the correct answer.