A supply regression is estimated, $B1$ is $2\mathrm{.}0$ and $B1$ has a SE of $0\mathrm{.}50.$ What is the $t$ stat for $B1?$

$4\mathrm{.}00$

$0\mathrm{.}50$

$2\mathrm{.}00$

$1\mathrm{.}00$