The linear shape of ${\mathrm{C}}_2{\mathrm{H}}_2$  is due to

• A

  SP² hybridization of carbon and ${\mathrm{P}}^{\mathrm{\pi }}-{\mathrm{P}}^{\mathrm{\pi }}$  bond.

• B

  SP hybridization of carbon and  ${\mathrm{P}}^{\mathrm{\pi }}-{\mathrm{P}}^{\mathrm{\pi }}$ bond.

• C

  SP3 hybridization of carbon.

• D

  All the above.