Final answer:
The word that means 'excessively eager' is 'voracious'. It can refer to a great desire to eat or to engage intensely in an activity.
Step-by-step explanation:
The word among your choices that means “excessively eager” is voracious. The term voracious comes from the Latin word “vorac-”, meaning “devouring” or “great desire to eat”, but it can also describe someone with a strong eagerness for an activity. An example sentence would be: “Her voracious appetite for reading led her to finish the entire library collection”.
Other words such as lionize, voluble, and diurnal do not have the same meaning. Lionize means to treat someone as a celebrity, voluble relates to speaking fluently, and diurnal indicates something occurring during the day.