How would you respond to this reasoning? Oxygen is not a greenhouse gas; therefore, gases containing oxygen—such as ozone, nitrous oxide, and carbon dioxide—are not greenhouse gases either.

• A. True. It is impossible for a gas containing oxygen to be a greenhouse gas.
• B. True. Because oxygen is not a greenhouse gas, it is unlikely to combine with anything at a higher level of organization to form a greenhouse gas.
• C. True. Compounds display emergent properties that are very similar to those of the elements that form them.
• D. False. Compounds can have emergent properties that are very different from those of the elements that form them.