Sound — practice question

What approximate value does the speed of sound in air have at normal temperature?

• A$340\,\text{m s}^{-1}$
• B$34\,000\,\text{m s}^{-1}$
• C$340\,\text{km s}^{-1}$
• D$3.0 \times 10^{8}\,\text{m s}^{-1}$