For which of the scenarios below could we expect valid predictions from our least squares regression equation?

a.The range for our x data runs from 10.0 to 30.0, the value of r is -0.9 and we wish to predict y

when x = 0

b.The range for our x data runs from 10.0 to 30.0, the value of r is -0.9 and we wish to predict y

when x = 18

c.The range for our x data runs from 10.0 to 30.0, the value of r is 0.9 and we wish to predict y

when x = 38

d.The range for our x data runs from 10.0 to 30.0, the value of r is 0.02 and we wish to predict y

when x = 18