Please help i will give brainliest

News cameras take an overhead picture of a crowd at an outdoor event journalist then count the total number of people in the picture and use the sample of estimate the total number of people in the crowd this process is an example of

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2

What unit of been sure would be appropriate for the volume of a sphere with a radius of 2 meters