Read the following excerpt of a body paragraph.

Before DNA sampling, detectives could only use the five senses to make observations. These observations led detectives to clues that helped them solve cases. In The Mystery of the Lost Gem, Sherlock used his sight to find that the "furniture, books, pens, and pencils were all in their proper places." The thief didn't look around for valuables. This observation was the first clue that the thief lived or worked at the house. The fact that the safe that was not damaged also supported this theory. The locked windows and door confirmed the observation as well. Next, Sherlock listened to Mrs. Blakely's recount of events in the hallway. He used her information to search for more clues. In the text, Sherlock "felt a draft coming from the wall." This observation was the clue that led Sherlock to finding the hiding spot. Using sight, touch, and hearing, Sherlock made observations that were clues to solving the mystery, proving his reputation as a world-famous detective.

Which is the best topic sentence for this body paragraph?

A: As a world-famous detective, Sherlock Holmes made observations to find clues that helped him to solve mysteries.
B: Sherlock Holmes made observations that were clues to solving the mystery, proving his reputation as a world-famous detective.
C: Sherlock Holmes used observations to find clues.
D: Sherlock Holmes was a world-famous detective.