How might its capture be relevant to its geological activity?

Question

a. Even though Triton is much smaller than our Moon, Triton' surface shows evidence of relatively recent geological activity. This can be because of the tidal heating that occurred when the moon was captured.
b. There is no sign of any geological activity on Triton's surface. This can be because the Triton was captured from the outer space and being much older then the solar system it already lost any noticeable features produced by geological activity.
c. There is no sign of any geological activity on Triton's surface. This can be because unlike moons originally formed near the planet, captured Triton did not expirienced Neptune's gravity when it was forming, and all geological activity ended much earlier on Triton than on the other moons.
d. Even though Triton is much smaller than our Moon, Triton' surface shows evidence of relatively recent geological activity. This can be because Triton originally was much closer to the Sun and was heated by the solar light until recently.

Answer 1

Even though Triton is much smaller than our Moon, Triton' surface shows evidence of relatively recent geological activity. This can be because of the tidal heating that occurred when the moon was captured.