$f^{\text{'}}c=32$MPa

$d_n=233mm$

$=6\mathrm{.}99$

When the cross$-$section shown above is subjected to a positive bending moment,

using $d_n=233mm,$ the value of $I_{cr}$ is:

$($a$)$ None of the other answers is correct

$($b$)4502\mathrm{.}4{10}^6{m}^4$

$($c$)4502\mathrm{.}4{10}^{6}m{m}^4$

$($d$)3553\mathrm{.}75{10}^6{m}^4$

$($e$)3553\mathrm{.}75{10}^{6}m{m}^4$