The number of sigma and pi bonds in prop-2-enal are

• A

  $7\mathrm{\sigma }\text{ and }2\mathrm{\pi }$

• B

  $7\mathrm{\sigma }\text{ and }1\mathrm{\pi }$

• C

  $6\mathrm{\sigma }\text{ and }2\mathrm{\pi }$

• D

  $6\mathrm{\sigma }\text{ and }1\mathrm{\pi }$