Which of the following molecules has all the three types sp, sp² and sp³ of carbon atoms?

• A

  ${\mathrm{CH}}_2=\mathrm{CH}-\mathrm{CH}={\mathrm{CH}}_2$

• B

  ${\mathrm{CH}}_3-\mathrm{CH}=\mathrm{CH}-{\mathrm{CH}}_3$

• C

  ${\mathrm{CH}}_3-\mathrm{CH}=\mathrm{CH}-\mathrm{C}\equiv \mathrm{CH}$

• D

  ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2{\mathrm{CH}}_3$