Final answer:
Rodent feces are similar in appearance to brown rice grains, being elongated and pellet-shaped. Historical accounts hint at their proliferation and the problems they pose, indirectly suggesting the type of evidence such as fecal droppings that they leave in environments they inhabit.
Step-by-step explanation:
Rodent feces droppings typically look most similar to a. Brown rice grains. These droppings are generally elongated and pellet-shaped, indicating their origin from a rodent. Depending on the specific type of rodent, the size can vary slightly, but they commonly hold a resemblance to grains of brown rice. For instance, hamsters, which are often found in certain areas such as Asia Minor and Russia as quoted in historical observations, would leave behind such droppings. In contrast to the other options provided, rodent feces are neither as small as black pepper, as formless as white powder, nor as bright and inconsistent in shape as red chili flakes.
Observations from historical accounts give insight into the behavior of rodents in various environments. This behavior, including the storage and contamination of food supplies in dark places as described, leads to the presence of rodent feces wherein detail about its appearance can be drawn. Although these accounts do not directly describe the feces, they help deduce the type of evidence, such as droppings, that rodents leave behind.