Given That Methane (CH₄) Has a Bond Angle of 109 $\degree$

Given that methane (CH₄) has a bond angle of 109.5 $\degree$ and ethylene (C₂H₂) has a bond angle of 120 $\degree$ , what is the correct bond angle for acetylene (C₂H₂) ?

A) 1.5 $\degree$
B) 160 $\degree$
C) 180 $\degree$
D) 360 $\degree$