I need help here, BTW $1\mathrm{.}100$ and $1\mathrm{.}022$ atm are wrong.

In the $H_2$ gas lab, the water temperature was $24C$ and the atmospheric pressure was $1020\mathrm{.}9\frac{m}{b}ar.$ If $1$atm is $1013\mathrm{.}25\frac{m}{b}ar,$ then

what is the pressure due to $H_2$ in atm?

A$.1\mathrm{.}100$atm

B$.1\mathrm{.}022$atm

C$.0\mathrm{.}978$atm

D$.0\mathrm{.}911$atm I