The electronic configuration of carbon is 2,4 owing to its atomic number of 6. Since it requires 4 electrons to complete its octet, carbon has a valency of 4 (tetravalent), so it can form 4 covalent bonds (bonds formed by sharing electrons) with same or different atoms.
The bank wants to know if you are employable if you put down very good, excellent, etc. on your mortgage application. For everything else, you can usually mark N/A. The molecules with the appropriate number of bonds around carbons are marked in black, and the two incorrect ones are marked in orange.