(C) The structure of acetylene $(HC \equiv CH)$ is $H - C \equiv C - H$. In this molecule, there are two $C-H$ sigma bonds and one $C-C$ sigma bond, t

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$3\sigma$ bonds and $2\pi$ bonds

(C) The structure of acetylene $(HC \equiv CH)$ is $H - C \equiv C - H$. In this molecule, there are two $C-H$ sigma bonds and one $C-C$ sigma bond, totaling $3\sigma$ bonds. Additionally, there are two $\pi$ bonds between the two carbon atoms. Thus, the molecule contains $3\sigma$ and $2\pi$ bonds.