Final answer:
The Beep Run is designed to measure a person's endurance or cardiovascular fitness, as it involves keeping up with audio beeps that progressively get faster and require sustained stamina. Option B is the correct answer.
Step-by-step explanation:
The Beep Run, also known as the beep test or the pacer test, is designed to measure a person's endurance or cardiovascular fitness. The test involves running back and forth between two markers, 20 meters apart, in time with audio beeps that progressively get faster. As the test continues, it becomes more challenging to keep up with the pace, and the participant's stamina and endurance are ultimately tested. It does not significantly test for strength, flexibility, or speed in the same way. Therefore, the best answer to the question is B. Endurance.