What Evidence Can You Give That Shows the Surface of Jupiter's

Multiple Choice

What evidence can you give that shows the surface of Jupiter's moon Europa must be relatively young?

A) there are thousands of active volcanoes on Europa's surface
B) we see very few craters compared to the surfaces of Callisto and Ganymede
C) radioactive rocks from Europa that have been brought back to Earth by our probes show that Europa is a young moon
D) the interior of Europa is made of metals like iron and nickel
E) Europa was not orbiting Jupiter when Galileo observed its moons, but now it is