The number of sigma$\left(\sigma \right)$ and pi$\left(\pi \right)$ bonds in pent- 2-en-4-yne is

• A

  $13\mathrm{\sigma } \mathrm{bonds} \mathrm{and} \mathrm{no} \mathrm{\pi } \mathrm{bond}$

• B

  $10\mathrm{\sigma } \mathrm{bonds} \mathrm{and} 3\mathrm{\pi } \mathrm{bonds}$

• C

  $8\mathrm{\sigma } \mathrm{bonds} \mathrm{and} 5\mathrm{\pi } \mathrm{bonds}$

• D

  $11\mathrm{\sigma } \mathrm{bonds} \mathrm{and} 2\mathrm{\pi } \mathrm{bonds}.$