Magnesium is allowed to react with dilute hydrochloric acid at the same concentration in four experiments under different conditions. Which reaction was completed in the least time?
- A$2\text{ g}$ of magnesium powder in $50\text{ cm}^3$ of dilute HCl at $45^{\circ}\text{C}$
- B$2\text{ g}$ of magnesium powder in $50\text{ cm}^3$ of dilute HCl at $50^{\circ}\text{C}$
- C$2\text{ g}$ of magnesium ribbon in $50\text{ cm}^3$ of dilute HCl at $45^{\circ}\text{C}$
- D$2\text{ g}$ of magnesium ribbon in $50\text{ cm}^3$ of dilute HCl at $50^{\circ}\text{C}$