The correct answer is D. Benvolio noticed that Romeo purposely hid from him.
At the beginning of his speech, Benvolio says that he made towards Romeo, "but he was ware of me," so we know that Romeo saw Benvolio following him.
However, then Benvolio says that he "gladly shunn'd who gladly fled from me." This means that Benvolio chose to shun, or avoid, Romeo, who clearly fled from him.
Therefore, Benvolio chooses not to approach Romeo because he sees Romeo is purposely avoiding him.
