In the scenario described, one carbon atom is bonded to another carbon atom and a hydrogen atom. The bond between the two carbon atoms would typically be a single covalent bond.
Covalent bonds are formed when two atoms share electrons. In most organic compounds, carbon atoms usually form single bonds with other carbon atoms unless there is a multiple bond (like a double or triple bond), which is not indicated in your description. Therefore, the correct answer is:
Single covalent.