If a carbon atom is bonded to two hydrogen atoms and two carbon atoms, what type of bond must exist between the carbon atoms?

Single covalent bonding

Covalent bonding is the type of bonding that takes place when two atoms share a pair of electrons with each other. In order to form a molecule, these two electrons are glued to one or more atoms. One important contribution of non-covalent bonding is the oxygen we breathe. On the other hand, polar covalent bonding happens when a pair of electrons are being shared unequally because one of the atoms spends way too much time with another electrons rather than with the atoms. 

On edgenuity it is d: watermelons