Which is the correct order of ionic sizes (At. No. : Ce = 58, Sn = 50, Yb = 70 and Lu = 71) [AIEEE 2002]

Which is the correct order of ionic sizes (At. No. : Ce = 58, Sn = 50,

1.	Which is the correct order of ionic sizes (At. No. : Ce = 58, Sn = 50, Yb = 70 and Lu = 71) [AIEEE 2002]
A.	\[Ce>Sn>Yb>Lu\]
B.	\[Sn>Ce>Lu>Yb\]
C.	\[Lu>Yb>Sn>Ce\]
D.	\[Sn>Yb>Ce>Lu\]
Answer» C. \[Lu>Yb>Sn>Ce\]