A person leaves her camp at 7:00 a. m. to hike back to her car. The distance from the car in kilometers y after a hours of hiking can be modeled by the linear function y=-3x + 18. What does the x-intercept of
the function mean.

A. The person started hiking at 7:00 a. m.

B. The person is hiking 3 kilometers per hour.

C. The person started 18 kilometers from the car,

D. The person will take 6 hours to get back to her car.