Task: Question Answering
Input (English): Male barn swallow birds with symmetrically-shaped wings find mates more quickly than males with asymmetrical wing shapes. Which statement best explains the significance of symmetry in the barn swallow population?  
 (A) Symmetrical wings are attractive to females. (B) Symmetrical wings indicate genetic mutations. (C) Symmetrical wings indicate that males are good predators. (D) Symmetrical wings are signs that a bird is very aggressive.
Output (English): A