Based on the Molecular Formula C₁₀H₁₈ and Using

Based on the molecular formula C₁₀H₁₈ and using only four-, five-, six-, or seven-membered ring subunits, provide line drawings for
A) two different compounds where two rings do not share any carbons.
B) two different compounds where two rings share one carbon.
C) two different compounds where two rings share two carbons.