The speed of sound in air at sea level is about 340 meters per second. This means sound travels through air at this speed when conditions are normal, such as at a temperature of around 20°C (68°F).

Sound moves by vibrating air particles. The speed can change if the air temperature or pressure changes, but at sea level under normal conditions, 340 m/s is a good average.

This speed helps us understand how long it takes for sounds, like thunder or voices, to reach our ears over a distance.

The other options (300, 320, 370 meters per second) are close but not exact.

So, the correct answer is 340 meters per second.