Does Use of the Rule for Organic Structures, "Carbon Atoms

Multiple Choice

Does use of the rule for organic structures, "Carbon atoms bond together to form a chain," mean that organic structures will always have two end-carbon atoms?

A) Yes, always.
B) No, never.
C) Yes, but only when the compounds are alkanes.
D) Yes, if the compounds are alkanes, and are not cyclic alkanes.