Sound — practice question

What is a representative value for the speed of sound in air?

• A$3.3 \times 10^4\,\text{cm s}^{-1}$
• B$3.3 \times 10^4\,\text{m s}^{-1}$
• C$3.3 \times 10^2\,\text{km s}^{-1}$
• D$3.3 \times 10^8\,\text{m s}^{-1}$