We hope you weren't afraid to pick answer D. The Latin word "trepidare" means "to tremble," and it traces back further to the adjective "trepidus," meaning "agitated." A synonym of "trepidation" is "fear," which comes from the Old English word for "sudden danger." "Fright" is another, and it comes from an Old English word that also meant "fright." "Panic" comes from the name of the Greek god Pan. Although he was usually thought of as a pipe-playing woodland god, Pan was also believed to become very frightening at times. From this frightening aspect of Pan's nature, Greek writers came up with the word "panikon," which meant "groundless fear," and which is the ultimate source of the English word "panic."