A few compounds that may be used as fertilisers are shown below. ammonium nitrate potassium nitrate potassium phosphate sodium phosphate Three elements needed for plant growth have the atomic symbols N, P and K. For each compound, how many of these three elements are present?
- A1, 1, 1, 2
- B1, 2, 2, 1
- C2, 1, 1, 2
- D2, 2, 2, 1