A heavy mass is attached to a thin wire and is whirled in a vertical circle.  The wire is most likely to break

• A

  When the mass is at the lowest point

• B

  When mass is at the highest point

• C

  When wire is horizontal

• D

  When mass is at an angle ${\cos }^{-1}\left(\frac{1}{\sqrt{2}}\right)$  of  from upward vertical