Where do bumble bees commonly nest?

Bumble bees commonly nest underground, which is the correct answer. This behavior is largely attributed to their preference for specific nesting sites that offer protection from environmental conditions and predators. Many bumble bee species will choose abandoned rodent burrows or other cavities in the soil for their nests, allowing them to create a secluded environment for raising their young.

When considering the other options, while some bees may nest in trees or buildings, it is more typical for types of bees other than bumble bees. Bumble bees are less likely to establish their colonies in such locations as they thrive in grounded environments that provide the right type of insulation and humidity. Nesting in flower pots can occur occasionally but is not a common behavior for bumble bees; they prefer spaces that are more hidden and protective, further reinforcing the idea that underground nesting is their primary choice.