The correct answer is (D) A tendency to or towards (action, habit, or attitude); inclination towards (habit, attitude of mind, etc., particularly one that is undesirable); propensity or predisposition to.

Proclivity comes from French proclivité, Latin proclivitas (pro + clivus [slope]).

Examples of use:

• He had a proclivity to meticulousness in his housekeeping.
• She had no proclivity towards jogging or other fitness activities.