Which hypothesis is best supported by the observation of an animal that spends much of its time digging?

The best-supported hypothesis from the observation of an animal that spends much of its time digging is that it spends much of its time digging. This statement directly reflects the behavior observed in the animal, suggesting that digging is a significant activity for this creature. Such behavior could be related to various activities like foraging for food, creating burrows for shelter, or evading predators.

By stating that the animal spends much of its time digging, this hypothesis is based on direct evidence and aligns closely with the observed behavior, making it the most logical inference. Additionally, hypotheses like having a diet consisting of soil or thriving in aquatic environments do not have direct support from the given observation. Instead, they introduce assumptions about the animal's dietary needs and habitat that are not warranted solely by the act of digging.