I : Square : : Arc : II
    I.   [A] Line  [B] Diagonal  [C] Rectangle  [D] Perimeter
   II.   [P] Chord  [Q] Circle  [R] Diameter  [S] Circumference

 

Answer: D. AQ

First is a part of the second.

Posted in:  Double Analogy -  Analogy -  Verbal Reasoning