Which element do authorities try to limit in pollution prevention approaches in freshwater lake ecosystems? 

A)  calcium 
B)  sulphur 
C)  phosphorus 
D)  nitrogen

Phosphorus

A chemical element essential for life, involved in numerous cellular processes and a critical component of DNA and bone mineral.

Pollution Prevention

The practice of reducing or eliminating waste and pollutants at their sources, prior to recycling, treatment, or disposal.

Freshwater Lake

A large body of standing water that contains low concentrations of dissolved salts, distinct from sea water, providing habitat for a diverse range of organisms.