An object is released from rest at a distance of \(3R_E\) from the center of Earth, where \(R_E\) is the radius of Earth. The object falls toward Earth's surface through a vacuum. Which of the following graphs best represents the magnitude of the object's acceleration \(a\) as a function of its distance \(r\) from the center of Earth for the range \(R_E \le r \le 3R_E\)?