Correct Answer: Compliant

Solution : The correct answer is the first option.

The word rowdy refers to a noisy and disorderly atmosphere, whereas compliant means obedient and well-behaved and is the appropriate antonym.

The meanings of the other options are as follows:

• Chattering means a constant, low-pitched sound, like the noise small animals make.
• Disorderly means lacking regular or logical order.
• Noisy means making loud and usually unpleasant sounds.

So, the correct sentence is: "This is such a compliant classroom."