Answer:B.It can be difficult to determine one's body fat because the test administrator can easily make an error.
Explanation:The measurements are less reliable in elderly people, due to their weak skin and muscles. Due to that their muscles can also be taken in the skinfold. It also gives unreliable readings when it comes to measuring people who have chronic muscle diseases. Lastly, the measurements should be performed by a trained person; the accuracy of the measurements relies highly on how it is done.