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.
A) Stamina I'm pretty sure
Answer:
We can learn what animals contribute to our sociality and what animals we need to worry about
Explanation:
like bees and butterflies pollinate our flowers but like mosquitoes infect us with viruses
I think it would be D, but don’t take my word for it.
