Correct Answer: cool

Solution : The correct choice is the first option.

Explanation: "Warm" typically refers to a moderate or higher temperature. Its opposite, "cool," refers to a lower temperature. While "hot" also signifies a high temperature, in the context of opposites, "cool" is the direct antonym that signifies a lower temperature compared to "warm".

The meanings of the other options are as follows:

• Springy means having elasticity or bounce.
• Spongy means soft and compressible.
• Hot means having a high temperature.

Therefore, the correct answer is cool.