Which observation would best support that the bond present was a covalent bond?

A covalent bond is present between two non-metals that share electrons in their molecular structure.

Explanation:

Examples of covalent bonds may be between carbon dioxide or water. And there may be three types of covalent bonds such as ionic, covalent and polar. In the first type, there is a transfer of an electron resulting in a gain for one of the atoms. In the second type, there is a sharing of electrons between the atoms. The third type is characterized by a difference in electronegativity between atoms.

carbon and oxygen share pairs of valence electrons

Explanation: its self explanatory

whats the meaning of /

the answer your looking for is c).