Final answer:
b) Pen clicking. The source of annoyance mentioned in the statement is pen clicking, which refers to the habit of repeatedly pressing and releasing the top of a pen, producing a clicking sound. This behavior can be irritating, especially in quiet environments or during tasks that require concentration.
Step-by-step explanation:
The source of annoyance mentioned in the statement "Nothing annoys me more than rapidly clicking your pen" is pen clicking.
Pen clicking refers to the habit of repeatedly pressing and releasing the top of a pen, producing a clicking sound. This behavior can be irritating to some individuals, especially in quiet environments or when it is done continuously.
For example, imagine being in a library or during a test, and someone sitting next to you is clicking their pen rapidly. The sound can become a distraction and annoyance, making it difficult to concentrate.