In an octahedral structure,the pair of $d$ orbitals involved in ${d^2}sp^3$ hybridization is

• A
  ${d_{x^2}}, {d_{xz}}$
• B
  ${d_{xy}}, {d_{yz}}$
• C
  ${d_{x^2-y^2}}, {d_{z^2}}$
• D
  ${d_{xz}}, {d_{x^2-y^2}}$