Which of the following best describes a possible carbon compound?

a. one carbon atom forms a quadruple bond with another carbon atom.
b. one carbon atom forms a double bond with an oxygen atom and two single bonds with two hydrogen atoms.
c. one carbon atom forms five single bonds with five hydrogen atoms.
d. one carbon atom forms a triple bond with another carbon atom and a double bond with an oxygen atom.

Let's eliminate some options.
Option A: quadruple bonds will most likely not occur between two carbon atoms. so option A is out.
Option B: One double bond with oxygen and two single bonds with hydrogen atoms will give all atoms the "noble gas" or "octet" configuration they desire. Option B is true.
Option C: Carbon is most likely not large enough to have more than eight valence electrons (hypervalent), so option C is out.
Option D: One carbon only has four valence electrons to donate, so the same problem exists as in option C, and the carbon atom will not achieve hypervalence. Option D is out.
Therefore, option B is correct.

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