Which row lists the usual values for the speed of sound at room temperature in the materials named?
- Aair: $340\,\text{m s}^{-1}$; water: $1500\,\text{m s}^{-1}$; iron: $5100\,\text{m s}^{-1}$
- Bair: $340\,\text{m s}^{-1}$; water: $5100\,\text{m s}^{-1}$; iron: $1500\,\text{m s}^{-1}$
- Cair: $5100\,\text{m s}^{-1}$; water: $1500\,\text{m s}^{-1}$; iron: $340\,\text{m s}^{-1}$
- Dair: $3.0 \times 10^8\,\text{m s}^{-1}$; water: $3.0 \times 10^8\,\text{m s}^{-1}$; iron: $3.0 \times 10^8\,\text{m s}^{-1}$