What are undeveloped female bees that serve the working force of a hive called?

The correct answer is that undeveloped female bees that serve the working force of a hive are known as workers. Worker bees are typically female and are responsible for a variety of tasks within the hive, such as foraging for food, caring for the queen's brood, cleaning the hive, and defending it from intruders. They are called 'workers' because they perform the essential day-to-day activities that keep the colony thriving.

In contrast, queens are the reproductive females within the hive, responsible for laying eggs. Drones are the male bees whose primary role is to mate with a queen. Foragers, while they are a type of worker bee that specifically gathers nectar and pollen from flowers, do not encompass the full range of functions performed by all worker bees. Therefore, the term used to describe the broader category of undeveloped female bees that collectively make up the workforce of a hive is 'workers.'