A group of four friends go on a hike. The table below shows the relationship between their height above sea level, y feet, and the distance from the starting point, x feet. Distance (feet), x 10 12 14 12 10 Height (feet), y 2,200 2,225 2,300 2,350 2,400 Which of the following describes the table? A. a function only B. neither a function nor a relation C. both a relation and a function D. a relation only