The speed of sound is minimum in

The speed of sound is minimum in
A: Steel
B: Water at 25°C
C: Air at 0°C
D: None of these

Sound travels slowest in gases faster in liquids and fastest in solids. In cold air at zero Celsius the molecules are less energetic so speed is lower than in warm air. Water transmits sound faster than air. Steel transmits faster than water. Therefore minimum among listed media is air at zero Celsius.