Help?!?!

Amanda is trying to determine the typical mass of eggs that are produced by each of her chickens. Which of the following will give her the most accurate measurement?

A. Take the chicken with the average weight, and determine the average mass of all the eggs laid by that chicken after a few months.
B. Take a random sample of chickens, and determine the average mass of 20 random eggs laid by those chickens.
C. Take a random sample of eggs from each chicken over a few months, and determine the average mass of all the eggs.
D. Take a random sample of eggs from each chicken over a few months, and determine the average mass from each sample of eggs.