A flatbed truck travels in the +x-direction along a straight, level road with constant positive acceleration \(a_0\). At the instant the truck reaches forward speed \(v_0\), a small flare is released from rest relative to the truck at a height \(h\) above the bed. Air resistance is negligible. Which of the following graphs best represents the trajectory of the flare (vertical position \(y\) as a function of horizontal position \(x\)) from release until it reaches the bed, in the reference frame of an observer at rest on the ground and in the reference frame of the truck driver?