How does the tectonic activity of the terrestrial planets compare with that of the gas giants?

The terrestrial planets are rocky, so their solid surfaces can crack, shift, or deform through tectonic activity. Earth is active today, while Mercury, Venus, and Mars show evidence of tectonic activity in the past or present. Gas giants lack solid rocky surfaces with tectonic plates, so none have tectonic activity in that sense. Therefore, choice A is correct.

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