What is the symbol of the god of commerce, Hermes?

The caduceus is the correct answer, as it is traditionally recognized as the symbol of Hermes, the Greek god of commerce, among other attributes such as communication and travel. The caduceus is depicted as a staff entwined with two serpents and often topped with wings. In mythology, Hermes serves as a messenger for the gods and is associated with trade and negotiation, making the caduceus a fitting emblem for his role in commerce.

Other symbols like the trident, often associated with Poseidon, represent different deities and concepts. The laurel wreath is linked to Apollo, symbolizing victory and achievement, while the thunderbolt is a symbol of Zeus, representing power and authority. Each of these items is significant to their respective gods and does not align with Hermes' specific attributes and functions.