you want to estimate the number of students who bring their lunch to school everyday. Which of the following is the best sample for this situation?

80 students selected at random during lunch.
45 first year students selected at random.
50 female students selected at random.
All members of the Math club.

The best sample for this situation would be 80 students selected at random during lunch. This sample would provide a more representative and unbiased estimation of the number of students who bring their lunch to school everyday compared to the other options.