Walter is making a 300-miletrip from Wichita Falls, Texas, to Austin. After the first 120 miles, he continues driving at 65 mph. If the equation 120 + 65.x = 300 is used to describe this situation, what does the "<"represent?

A. x = the total number of miles Walter has driven so far

B. x = the distance remaining for Walter to drive

C. x = the speed at which Walter must drive

D. x = the number of hours Walter has left to drive