Break up phonetic letters into groups of three.

• A. Three
• B. Two
• C. Four
• D. Five

Answer: (A)

Grouping phonetic letters into sets of three tests how you partition a sequence into equal-sized chunks. If you break the letters so each group has three items, you create triads, which is exactly what the instruction asks for. Three is the right size because the task specifies the group length, ensuring every group contains three letters. Two would miss the requirement by making pairs, while four or five would exceed the specified size and disrupt the intended pattern. This approach is handy in radio communication too, since triads can make spelling easier to follow and reduce errors.