Osmium Tetroxide, OsO₄, Is a Soft Crystal That Melts at 40

Multiple Choice

Osmium tetroxide, OsO₄, is a soft crystal that melts at 40 ^$\circ$ C. The liquid does not conduct electricity. What kind of crystal is this

A) Ionic Crystal
B) Covalent Crystal
C) Metallic Crystal
D) Molecular Crystal
E) Amorphous (Not a regular crystal)