Please help pleaseeee

Answer:
The answer is C) two covalent bonds between adjacent molecules.
Explanation:
The exact definition of a double bond is, "a chemical bond in which two pairs of electrons are shared between two atoms. " - Taken from Google Dictionary
The following information was taken from Wiki to help you understand the question, and so that no one thinks that I plagiarized:
"A double bond in chemistry is a chemical bond between two chemical elements involving four bonding electrons instead of the usual two. The most common double bond occurs between two carbon atoms and can be found in alkenes. Many types of double bonds exist between two different elements."
I hope this helps!