Two carts of masses \(m_1\) and \(m_2\) are connected by an ideal, unstretched spring and rest on a horizontal, frictionless track. At time \(t = 0\), a constant external horizontal pulling force of magnitude \(F_0\) is applied to cart 2 directed to the right, causing the carts to accelerate and oscillate relative to one another. Which of the following graphs best represents the total linear momentum \(p_{\text{total}}\) of the two-cart system as a function of time \(t\)?