Concept:The word “reluctant” refers to a lack of willingness to do something.Explanation:“Reluctant” means not willing or hesitating to act.Example: She was reluctant to speak in front of the class.The word that matches this meaning is “unwilling”.The other options are antonyms of “reluctant”.“Eager”, “enthusiastic”, and “desirous” all mean showing willingness or interest.Thus, the correct synonym is “unwilling”.Answer:D. Unwilling