Which practices can be used to protect our supply of freshwater?

a-decrease biodiversity

b-improve waste management systems

c-increase conservation

d-reduce trade restrictions

e-reduce dependence on fertilizers and pesticides

Since it says practices, I'm guessing two answers are to be chosen.

C. would be one of the answers, as increasing water conservation can decrease the amount of freshwater we use, and B, as many waste products get into our freshwater supplies and contaminate it