Fact 1: Soil can be depleted of nutrients. Fact 2: Potassium carbonate is a valuable nutrient for plants. Given the two facts above, soil can be depleted of which of the following?

Select from the following. [i] Potassium carbonate [ii] Chlorophyll [iii] neon [iv] sedimentary rocks [v] carbon monoxide [vi] helium [vii] Organic compounds [viii] vegetation
Answer:
[i]