What bond angle would you expect for the $H-C-C$ bond angle in acetylene?

$H-C-=C-H$

$109\mathrm{.}5$

$180$

$90$

$120$

between $180$ and $120$

between $120$ and $109\mathrm{.}5$

between $109\mathrm{.}5$ and $90$