Select the correct answer. Function f approximately represents the trajectory of an airplane in an air show, where x is the horizontal distance of the flight, in kilometers. What is the symmetry of the function? A. The trajectory of the airplane is not symmetric. B. The trajectory of the airplane is symmetric about the line x = 102 km. C. The trajectory of the airplane is symmetric about the line x = 1.5 km. D. The trajectory of the airplane is symmetric about the line x = 2 km.