Which of the following words is used for the letter 'C' in the phonetic alphabet?

The correct word used for the letter 'C' in the phonetic alphabet is "Charlie." The phonetic alphabet, also known as the NATO phonetic alphabet, assigns a specific word to each letter to ensure clarity in communication, especially in military and aviation contexts where miscommunication can have serious implications.

"Charlie" is used to represent 'C' because it is distinct and easily recognized across different languages and accents, which helps prevent confusion during voice communication. The choice of words in the phonetic alphabet is carefully selected to avoid similarity with other letters, ensuring that each letter can be clearly understood when spoken. In contrast, the other provided words correspond to different letters in the phonetic alphabet: "Delta" represents 'D', "Echo" represents 'E', and "Foxtrot" represents 'F'. This specificity in nomenclature is crucial for effective communication in operations and missions.