Answer: D: It contains the largest caldera
Explanation: I took the test and it was right for me.
The tallest volcano in Europe is Mount Elbrus so that one is debunked.
The most active volcano in Europe is Mount Etna so that one is also debunked.
In 1630 B.C., the volcano exploded and collapsed leaving behind an almost circular hole. This is the caldera – visible today as a bay filled with seawater and lined by cliffs.
So BOOM! There's you're answer.