Why Do Planetary Scientists Believe There Are Active Volcanoes on Venus

Multiple Choice

Why do planetary scientists believe there are active volcanoes on Venus?

A) Images from the Russian Venera lander show a volcanic plume.
B) Radar evidence from the Magellan orbiter shows fresh basalt on the surface.
C) Radar mapping has indicated a boundary line between tectonic plates, and such boundaries always include volcanic activity.
D) The amount of short-lived sulfur compounds detected in the atmosphere of Venus implies regular replenishment.