Four friends - Alex, Brian, Charlie, and David - have different favorite colors: Red, Blue, Green, and Yellow. Alex does not like Red or Blue. Brian's favorite color is not Green. Charlie likes Blue. What is David's favorite color?
Answer: C. Yellow
Since Alex cannot like Red or Blue, and Charlie likes Blue, Alex must like Green or Yellow. Brian cannot like Green, so he must like Red. Therefore, David's favorite color must be Yellow.