The answer is C. Chaos.

In the original pair, "command" is the cause of "order". When someone gives a command, it creates order in the situation. Similarly, "confusion" is the cause of "chaos". When someone is confused, it creates chaos in the situation.

The other options do not have the same relationship. "Discipline" is not the cause of "order". In fact, discipline can help to create order. "Clarity" is not the cause of "chaos". In fact, clarity can help to prevent chaos. "Problem" is not the cause of "confusion". In fact, a problem can cause confusion.