A new study reports that listening to music during exercise improves endurance by an average of 12 percent. The participants in the study were experienced runners aged eighteen to thirty performing fixed-pace treadmill workouts. Whether comparable benefits would appear among novices, older athletes, or in less standardized settings remains unclear.
Which choice best describes the function of the third sentence in the text?
- Acheck_circle
It restricts the scope of the result by flagging populations and settings the study did not cover.
- B
It generalizes the result to all athletes.
- C
It introduces a different type of music.
- D
It defines the term 'endurance'.
Explanation
The third sentence specifies which populations and settings remain untested. B captures this scope restriction.