The tank illustrated has dimensions $5.0\,\text{m} \times 4.0\,\text{m} \times 4.0\,\text{m}$. It is filled completely with water of density $1000\,\text{kg m}^{-3}$. What is the mass of the water in the tank?
- A$12.5\,\text{kg}$
- B$62.5\,\text{kg}$
- C$16\,000\,\text{kg}$
- D$80\,000\,\text{kg}$