Which is true about rats?

Rats are known for their agility and speed, and one remarkable aspect of their capabilities is their running speed. They can indeed run at speeds of up to 6 miles per hour. This ability makes them efficient in escaping threats and navigating their environment quickly, which is a crucial adaptation for survival.

The other options suggest extreme capabilities that are not supported by common knowledge or research about rat physiology and behavior. For example, while rats are strong swimmers, the claim about treading water for a week is exaggerated. Likewise, the ability to leap 10 feet straight up is beyond their physical capabilities, and although rats can survive significant falls due to their lightweight and flexible bodies, surviving a fall from more than 100 feet is highly unlikely. Thus, the statement regarding their running speed is the most accurate reflection of their characteristics.