The correct order of heat of combustion for following alkadienes is :

• A

  $\left(\mathrm{c}\right)<\left(\mathrm{b}\right)<\left(\mathrm{a}\right)$

• B

  $\left(\mathrm{b}\right)<\left(\mathrm{c}\right)<\left(\mathrm{a}\right)$

• C

  $\left(\mathrm{a}\right)<\left(\mathrm{b}\right)<\left(\mathrm{c}\right)$

• D

  $\left(\mathrm{a}\right)<\left(\mathrm{c}\right)<\left(\mathrm{b}\right)$