What is the basis of an organic molecule?

The molecules are organic where there's a presence of nitrogen, oxygen, and other atoms adds variety to these carbon molecules.
--Four important classes of organic molecules: carbohydrates, lipids, proteins, and nucleic acids—are discussed in the following sections.

Its in the national history museum and you can't se the original because its locked away in a vault 

Ithink the answer to that would be b):