Which of the following statements is true?

• A
  Hybridisation of the central atom in $NH_3$ is $sp^2$
• B
  $BeCl_2$ has $V$ shape while $SO_2$ is linear
• C
  $SF_6$ is octahedral and $F-S-F$ bond angle is $90^{\circ}$
• D
  $CO_2$ has a dipole moment