A swimming pool with a rectangular shape measures $50\,\text{m}$ in length and $25\,\text{m}$ in width. Water fills it to a depth of $2\,\text{m}$. The water has a density of $1000\,\text{kg m}^{-3}$. Calculate the mass of water in the pool.
- A$2.5\,\text{kg}$
- B$2500\,\text{kg}$
- C$77\,000\,\text{kg}$
- D$2\,500\,000\,\text{kg}$