The maximum age of features on the surface of Venus appears to be:
A) less than 10 million years, due to wind and chemical erosion.
B) about 250 million years, due to recycling of the crust by plate tectonics.
C) 3 to 4 billion years, due to an absence of surface activity since early times.
D) about 700 million years, due to constant resurfacing of the planet by lava flows.
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