Final answer:
The word synonymous with witty, funny, playful, and jocund is b) 'mirthful'. This choice aligns closely with the provided synonyms meant to indicate a merriment or enjoyment reflected in humor.
Step-by-step explanation:
The word that has the synonyms witty, funny, playful, and jocund is b. Mirthful.
The term 'jovial' often describes someone who is cheerful and good-humored in a hearty, robust way. 'Lighthearted' implies a carefree, cheerful disposition, without burdens or serious concerns. 'Whimsical' usually points towards unpredictability and playfulness in imagination or action, often creatively or fancifully so. However, the term 'mirthful' best captures the essence of being filled with merriment or fun, aligning with the synonyms provided.