Step 1: Understanding the Concept:
This is a vocabulary-based sentence completion question. We need a noun that logically fits the context of "international student mobility".
Step 2: Detailed Explanation:
The sentence talks about aspects of student mobility that are "well known".
"Benefits" refers to the advantages or positive outcomes, which is the most common and logical word used when discussing educational exchange programs.
"Temper" (disposition), "Energy", and "Position" do not fit the context of a phenomenon like mobility being "well known" in a general academic or policy sense.
Step 3: Final Answer:
The word "benefits" completes the sentence logically.