The type of bonds present in sulphuric anhydride $(SO_3)$ are:

• A
  $3 \sigma$ and three $p \pi-d \pi$ bonds
• B
  $3 \sigma$,one $p \pi-p \pi$ and two $p \pi-d \pi$ bonds
• C
  $2 \sigma$ and three $p \pi-d \pi$ bonds
• D
  $2 \sigma$ and two $p \pi-d \pi$ bonds