When the mid-upper arm circumference and triceps skinfold of an 82-year-old man are evaluated, which is important for the nurse to remember?

When the mid-upper arm circumference and triceps skinfold of an 82-year- old man are evaluated, it is important to remember that: 
these measurements may not be accurate because of changes in skin and fat distribution.
As a person grow older, there will be less collagen exist in their body, which caused the body unable to hold the skin in its proper place anymore.

Ithink it's choice d (antibiotic resistance)