The indicator cresol red turns from red to yellow in acid. Four agar blocks that contained cresol red were cut into different sizes, measured in millimetres. The blocks were then placed in acid. All the other variables were kept the same. The time needed for each block to become completely yellow was noted. Which of the four blocks turned completely yellow the fastest?
- A3 \times 30 \times 30
- B6 \times 6 \times 6
- C6 \times 12 \times 12
- D12 \times 12 \times 12