Two small conducting spheres, \(A\) and \(B\), each of mass \(m\), are placed on a frictionless insulating surface separated by a distance \(d\) in a vacuum. Sphere \(A\) carries a net charge of \(+q\), and sphere \(B\) carries a net charge of \(+3q\). The spheres are released from rest simultaneously. Which of the following correctly compares the magnitudes of the initial accelerations \(a_A\) and \(a_B\) of the two spheres immediately after release, and provides the correct physical justification?