The P2O5 in all fertilisers comes from

Answer: Option C

The P₂O₅ in all fertilizers comes from Phosphate rock.
Phosphate rock is the primary source of phosphorus (P) and the main raw material for phosphate fertilizers.
Phosphate ore is extracted from sedimentary deposits (85% of world production) and magmatic deposits. Phosphate ore grades range between 2% and 35% phosphorus pentoxide (P₂O₅).