What genus does the groundhog belong to?

The groundhog belongs to the genus Marmota.

Its full scientific name is Marmota monax: Marmota is the genus and monax is the species epithet. The groundhog is therefore one of the marmots, a group of large ground squirrels in the family Sciuridae. Unlike several mountain-dwelling marmots, it commonly lives in lowland fields, woodland edges, pastures, and gardens.

The genus contains about 15 recognized living species distributed across North America, Europe, and Asia. Other familiar members include the alpine marmot and the hoary marmot. Groundhogs are unusual among marmots for thriving in relatively low elevations and in landscapes substantially modified by people.

Marmota is not interchangeable with the genera in the answer choices. Castor contains beavers, Tamias contains chipmunks, and Sciurus contains many tree squirrels. The groundhog is also not a separate kind of “hog”: it is a rodent and one of the largest members of the squirrel family.