$3.$ For a gas$-$liquid system, if the Henry's law constant $\backslash ($ H $\backslash )$ is $10$ atm$/$M and the partial pressure of the gas is $1$ atm, the concentration of the gas in the liquid phase is $\_\_\_\_\_$ M$.$

$-$ a$)0\mathrm{.}1$

$-$ b$)0\mathrm{.}01$

$-$ c$)1$

$-$ d$)10$