Which of the following gives the correct order of atomic radii of O, F and N?

Q. Which of the following gives the correct order of atomic radii of O, F and N?
A. O,F,N
B. N,F,O
C. O,N,F
D. F,O,N
Answer: F,O,N

A. O,F,N
B. N,F,O
C. O,N,F
D. F,O,N
Answer: F,O,N