The correct answer for the given statement above would be option C. A clause used as the object of a preposition is called a noun clause. The object of the preposition will always be a noun. Therefore, the only clause that is also used as the object of a preposition is only the noun clause.
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.
Answer:
Explanation: I collected data that impacted the prophecy of the climate and the discovery was in front diversity of people.
