 
<prompt> context: Casey became an expert on Aubrey.  They grew up together in the same neighborhood. 
 Question: Why did Casey do this? 
A. hear about Aubrey from others B. show that they knew Aubrey well C. ask others about Aubrey's childhood experience 
Refer to the context provided to answer the question that follows: <response>: B. show that they knew Aubrey well 