The correct answer is (C) Intense desire; eagerness; ardent desire; greediness. Also, the state or quality of being avid.

Avidity comes from Middle English avidite, French avidité, Latin avare (to crave).

Examples of use:

• They dined on 16-ounce steaks and mushrooms with avidity.
• The philosopher had an avidity to learn how we perceive space.