Final answer:
Calypso is often described as offering Hermes a feast of ambrosia and nectar.
Step-by-step explanation:
In Homer's works, there is no mention of Calypso offering any specific item to the god's messenger Hermes when he arrived at her home. However, in later literature and mythology, Calypso is often described as offering Hermes a feast of ambrosia and nectar. Ambrosia is the food of the gods and nectar is their drink that grants immortality. Therefore, the correct answer is b) A feast of ambrosia and nectar.