Context: Read the description of a trait.
Bernard has a scar on his left knee.
What information supports the conclusion that Bernard acquired this trait?
A. Bernard's scar was caused by an accident. He cut his leg when he fell off his skateboard.
B. Bernard's scar is on his left knee. His mother also has a scar on her left knee.
C. Bernard's brother has scars on both of his knees.
From the given choices, select the correct answer and reply with the letter of the chosen option.

A