What is the length range of an adult American cockroach?

The adult American cockroach typically measures between 1.5 to 2.0 inches in length, which aligns closely with the length range presented in option B, 1" to 1 1/2" long. This option accurately encompasses a portion of the actual size range of adult American cockroaches.

American cockroaches are among the largest common roach species found in the United States, and their size can vary based on environmental conditions and food availability. This species is mainly recognized for its reddish-brown color and long wings, which enable them to glide short distances, contributing to their spread in various environments.

Additionally, the other choices do not accurately represent the size of the American cockroach. For instance, the smaller ranges provided in options A and D are below the typical size for this species, while option C overestimates their size. Understanding the size range of this pest is crucial for effective pest control and identification in any locational context.