A guitar string has a length L = 63 cm from bridge to nut and sounds the note G2 (199.3 Hz) when plucked near one end. If the player touches their finger lightly on the string at L/4 from one end, list the lowest 3 modes of vibration (harmonics) which survive?

Their acceleration is zero. therefore the correct answer is C.

Acceleration is defined as the rate of change of velocity, since the runner is moves with the constant velocity, therefore their will be no change in its velocity with respect to time, or the rate of change of velocity (acceleration) is zero.