What feature of Mud Daubers differentiates them from social wasps?

Mud Daubers are indeed differentiated from social wasps primarily due to their solitary nature. Unlike social wasps that live in colonies and exhibit organized social behavior, Mud Daubers operate independently. Each female Mud Dauber constructs her own nest, which is often made of mud, and raises her brood without assistance. This behavior underscores their solitary lifestyle, setting them apart from social wasps that collaborate in nest-building and caring for the young.

The other options, while they may seem relevant, do not accurately capture the defining characteristic of Mud Daubers. For instance, social wasps typically build nests in groups, which directly contrasts with the solitary nature of Mud Daubers. The assertion that they are larger than typical wasps is also misleading; Mud Daubers vary in size but are not universally larger than social wasps. Lastly, while Mud Daubers do consume pollen, they are primarily known for preying on spiders to provision their nests, and their diet is not limited to pollen. This focus on their solitary lifestyle is critical in understanding their behavior and ecological role in contrast to social wasps.