How should the number "6" be pronounced when spoken on the radiotelephone?

Correct Answer: Option D — SOK-SEE-SIX

Standardized marine radiotelephone procedures require numbers to be pronounced using specific phonetic equivalents. The number '6' is spoken as 'SOK-SEE-SIX' to prevent acoustic confusion with similarly sounding digits like 'three' or 'five' during distress traffic.