One$-$year Treasury securities yield $1\mathrm{.}00\%.$ The market anticipates that $1$ year from now, $1-$year Treasury securities will yield $2\mathrm{.}00\%.$ If the pure expectations theory is correct, what is the yield today for $2-$year Treasury securities$?$

Question $2$ options:

$2\mathrm{.}50\%$

$0\mathrm{.}50\%$

$3\mathrm{.}00\%$

$1\mathrm{.}50\%$