A block of mass \(M\) and a solid sphere of mass \(M\) are released from rest at the top of two identical ramps of height \(h\) and angle \(\theta\). The ramp for the block is frictionless, while the ramp for the sphere has sufficient friction for the sphere to roll without slipping. Which of the following graphs best represents the speed \(v\) of the center of mass for the block and the sphere as a function of time \(t\) while they are on the ramps?