Answer : Figure B shows maximum tangential speed.
Explanation :
When a body is moving in a circular path of radius r and angular velocity
, then its tangential speed is given by :

or it can also defined as :
In circular motion distance covered by particle is,

and if t is the time.
So,

In circular motion the object moves tangentially and the magnitude of tangential speed is same in all direction.
So, figure (B) shows the greatest tangential speed.