Biologists Advising Park Rangers Wondered How Best to Dispose of Human

Biologists advising park rangers wondered how best to dispose of human wastes with the potential of transmitting diarrhea at remote camping sites along a turbulent river.Every year thousands of people canoe down the river and are required to stay at predetermined campsites.These remote locations are not accessible by road or any large boat.Which of the following strategies of managing human waste would have the least impact on the environment?

A) Encourage people to urinate in the river and carry out solid human waste in special biodegradable bags later to be disposed of as hazardous waste.
B) Require everyone to dig their own latrine and bury their own waste when they are done.
C) Accumulate all human wastes in large tanks,seal them forever and bury them when they are full.
D) Allow people to leave all human wastes on top the ground as long as they are out of sight.