Four students gather the gas formed when calcium carbonate reacts with dilute hydrochloric acid. Each student measures the time required to collect a given volume of gas. Which results indicate the greatest average rate of reaction?
- A$15\,\text{cm}^3$ of gas collected in $20\,\text{s}$
- B$50\,\text{cm}^3$ of gas collected in $40\,\text{s}$
- C$75\,\text{cm}^3$ of gas collected in $80\,\text{s}$
- D$90\,\text{cm}^3$ of gas collected in $100\,\text{s}$