A cylist moves from a certain point X and goes round a circle radius, r and reaches Y, exactly at the other side of the point X, as shown in the given figure. (i) The displacement of the cylist would be

• A.  \[\pi r\]              
• B.                         \[2\pi r\]
• C.                         \[2r\]   
• D.                         \[\frac{2\pi }{r}\]