Which of the following examples would most accurately measure the density of the population being studied?

A)counting the number of prairie dog burrows per hectare
B)counting the number of times a 1 kilometre transect is intersected by tracks of red squirrels after a snowfall
C)counting the number of coyote droppings per hectare
D)multiplying the number of moss plants counted in 10 quadrats of 1m² each by 100 to determine the density per kilometre²
E)counting the number of zebras from airplane census observations