Which of the following orbitals does not participate in the hybridisation in ${\mathrm{IF}}_7$ ?

$d_{yz}$ does not participate in the hybridisation in ${\mathrm{IF}}_7$ $s+p_x+p_y+p_z+d_{xy}+d_{x^2-y^2}+d_{z^2}$. So, the correct answer is D.