Four leafy shoots taken from the same plant were placed in beakers of coloured water and kept in rooms at different temperatures. In two of the rooms, electric fans were arranged to blow air over the stems. For each stem, the time for the coloured water to arrive at the leaves was recorded. In which stem will the coloured water reach the leaves the fastest?
- A$10\,^{\circ}\text{C}$
- B$10\,^{\circ}\text{C}$ with a fan
- C$30\,^{\circ}\text{C}$
- D$30\,^{\circ}\text{C}$ with a fan