Final answer:
The curl-up test is designed to evaluate abdominal muscular endurance and not used to assess cardiovascular endurance, flexibility, or upper body strength.
Thus option c. is correct answer.
Step-by-step explanation:
The curl-up test is typically completed to evaluate one aspect of physical fitness known as muscular endurance, specifically to assess the endurance of the abdominal muscles. The correct answer to the given question is C. To evaluate abdominal strength. This test involves performing as many curl-ups or sit-ups as possible following a set procedure to ensure consistency and safety.
However, it is not used to assess cardiovascular endurance, which refers to the ability of the heart and lungs to supply oxygen to the muscles during sustained physical activity.
Likewise, it does not measure flexibility, which is the range of motion available at a joint or group of joints, nor is it an indicator of upper body strength, which is the maximal force generated by the upper body muscles in a singular voluntary contraction.
Thus option c. is correct answer.