The only real accurate way to determine the amount of body fat is:

underwater weighing
post death dissection
bioelectrical impedance
girth measurements

I think the correct answer among the options given is the last option. The only real accurate way to determine the amount of body fat is girth measurements. It is a process where it involves taking measurements at specific body sites and recording it. These measurements are converted to a constant used to predict percent body fat.

Drop out early hard to juggle both