Final answer:
C2H2, also known as acetylene, is a carbon molecule that contains a triple bond between its two carbon atoms.
Step-by-step explanation:
Carbon has the capability to form stable covalent bonds with itself, allowing the creation of compounds with single, double, and triple bonds. An example of a carbon molecule that contains a triple bond is C2H2, also known as acetylene. While other options given, such as CO2 (carbon dioxide) and CH4 (methane), are molecules that contain carbon, CO2 has two double bonds and CH4 has four single bonds, thus none of them have a triple bond. In contrast, C2H2 has a triple bond between the two carbon atoms, which effectively satisfies the query for a carbon molecule containing a triple bond.