Explanation:

- Option 1: 343 m/sec

- This is the correct answer.

- 343 meters per second is the standard velocity of sound in air at 20°C (68°F) at sea level.

- Option 2: 110 m/sec

- This speed is much lower than the actual speed of sound in air. A similar velocity might be encountered in some materials, but not in air under standard conditions.

- Option 3: 220 m/sec

- This speed is also incorrect. While it's more than half of the speed of sound in air, it's not accurate.

- Option 4: 232 m/sec

- This is not the correct speed of sound in air under normal conditions.