Which one of these is a whole number?

a. 4/7
b. square root of 8
c.0
d.0.1

Will give brainliest if you answer question correct

3. solve the given inequality and graph the solution on a number line.

An architect is designing a water fountain for a park she uses the given function to model the water jet flowing from the fountain nozzles where h(x) gives the height of the water jugs in feet x feet from the starting point h(x)=-1/20x+x+15