What is a coordination compound?

• A
  $A$ compound formed by the combination of two or more simple salts.
• B
  $A$ compound containing a central metal atom or ion bonded to a surrounding array of molecules or anions,called ligands.
• C
  $A$ compound that dissociates completely into its constituent ions in aqueous solution.
• D
  $A$ compound formed by the sharing of electrons between two non-metal atoms.