The indicator cresol red, changes from red to yellow when put into acid.
Four blocks of agar containing cresol red were cut to different sizes measured in millimetres. The blocks were submerged in acid. All other variables were kept constant. The time taken for each of the blocks to completely turn yellow was recorded.
Which of the four blocks became completely yellow most quickly?
$3 \times 30 \times 30{\text{ }}$
2 )
$6 \times 6 \times 6{\text{ }}$
3 )
$6 \times 12 \times 12{\text{ }}$
4 )
$12 \times 12 \times 12{\text{ }}$
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