18) A

Since volume of water is rounded to nearest 10 cm^3,
Minimum volume of water = 5

1% of 5 = 0.05

Since volume of each droplet is 0.02 rounded to the nearest 0.01, maximum volume of droplets = 0.025

To ensure we do not have more than 1%, we would need = 0.05 / 0.025 = 2 droplets

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