Correct Answer: Disarray

Solution : The third option is correct.

Chaos refers to a state of complete disorder and confusion, often characterised by a lack of organisation or predictability. On the other hand, disarray is a synonym that specifically captures the essence of disorder and lack of arrangement.

The meanings of the other options are as follows:

• Insanity means a mental disorder.
• Tidiness means neatness and order.
• Certainty means absolute assurance.

Therefore, the correct answer is disarray.