Which of These Did the June 1908 Impact Event in Siberia

Multiple Choice

Which of these did the June 1908 impact event in Siberia and the 2013 event in the Russian city of Chelyabinsk have in common?

A) they both produced a large crater, which has become a tourist attraction
B) they both killed a lot of innocent people
C) they both went completely unnoticed by people (and we only know about them from instruments in space)
D) they both exploded high in the atmosphere and produced a shock wave that reached the ground
E) you can't fool me, those events had nothing in common