A block of agar, $1.0cm \times 1.0cm \times 1.0cm$, was stained uniformly with a water-soluble blue dye.
The block of agar was put into a test-tube containing $10c{m^3}$ of distilled water at ${20^ \circ }C$.
The intensity of the blue colour of the water after five minutes was measured.
Four other experiments, A, B, C and D, were then carried out using different numbers of agar blocks, different sizes of agar blocks and different temperatures. All other variables were standardised.
Which experiment would give a lighter blue colour in the water after five minutes compared to the first experiment?
1 )
A
B
3 )
C
4 )
D
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