A Young Girl Is Staring at the Raindrops Running Down

A young girl is staring at the raindrops running down her window. She notices that the raindrops remain more or less intact, even as they cascade down the windowpane. This is a result of:

A) covalent bonds between water molecules.
B) oxygen bonds between water molecules.
C) polar covalent bonds between water molecules.
D) hydrogen bonds between water molecules.
E) ionic bonds between water molecules.