What organ do bees use primarily for smelling?

Bees primarily use their antennae for smelling, making this the correct answer. The antennae are sensory organs that are highly developed in bees and contain numerous olfactory receptors. These receptors allow bees to detect a wide variety of scents in their environment, which is crucial for tasks such as foraging for nectar and pollen, identifying pheromones from their hive mates, and locating potential mates.

While other body parts such as mouthparts, wings, and legs serve vital functions, they do not play a primary role in the sense of smell. Mouthparts are mainly involved in feeding, wings facilitate movement, and legs are used for walking and grooming. The specialized structure of the antennae and their dense concentration of sensory cells makes them essential for the complex communication and survival behaviors seen in bees.