 
<prompt> context: Kai felt adventurous and decided to sign up for the half marathon with Andrew instead of the 10K as originally planned. 
 Question: Why did Kai do this? 
A. buy some new running shoes B. take on a challenge that required dedication and hard work C. get a race discount by entering to run Andrew's distance 
Refer to the context provided to answer the question that follows: <response>: B. take on a challenge that required dedication and hard work 