Final answer:
The synonym for "voracious" that best fits the context of appetites is "ravenous", indicating an extreme hunger.
Step-by-step explanation:
The most suitable synonym for "voracious" in the context of the sentence provided is ravenous. The word "voracious" is typically used to describe a great appetite or an eagerness to consume large amounts of something. Indeed, the cyclist's appetite is implied to be extremely large and difficult to satisfy, which is best matched by the synonym "ravenous", indicating a very great or even extreme hunger.
"Contestant" is unrelated as it refers to someone participating in a competition. "Anxious" refers to experiencing worry or nervousness, which doesn't relate to hunger. Finally, "light" typically denotes something that is not heavy or not intense, making it an unsuitable synonym for "voracious".