Answer:
the match was not played by them
The answer is C, though I maybe wrong. I hope this helps you. (And sorry if it doesn’t)
The reoccurring alternation of strong and weak sounds is rhythm.
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.
