The graph illustrates the effect of temperature changes on the rate at which stains are removed from clothes when a biological washing powder is used. What does the graph indicate about biological washing powders?
- ABiological washing powders contain enzymes.
- BBiological washing powders work best at all temperatures above $40\,^{\circ}\text{C}$.
- CThe optimum temperature for the reaction is between $10\,^{\circ}\text{C}$ and $30\,^{\circ}\text{C}$.
- DThere is a directly proportional relationship between the temperature used and the rate at which stains are removed.