I choose B because it was mainly about how reading helps your brain.
Answer:
My feeling when answering and doing the activity is happy. Explanation: Because I learned so many of them that's why I'm happy.
Go back to the text and re-read a passage where Watson made a discovery. If Sherlock praises him, you've got your answer. I'm sorry if this wasn't much help, but I don't have any text to go off of.