The pond waters in a location in Florida had an unusual taste and smell. Investigations revealed that storm water runoffs had carried huge amounts of animal wastes into the pond waters. What are people in the location most likely to do to prevent the water pollution?

train pet animals not to litter public places
grow trees and shrubs to prevent surface runoffs
use animal wastes as compost for the plants and trees in the garden
pick up dog and cat wastes around the house or while walking the pet

I think its either b or d, but I would like some guidance.