Which one is it

Question 3 0 Mark this question At a school of 900 students, 20% have blue eyes. A student randomly selects 100 students and finds 17% of them have blue eyes. A second student takes another random sample of 90 students and finds 24% of them have blue eyes. Which of the following explains why there is a difference between the two percentages? 0 Random error; the numbers were different due to variability inherent in sampling. 0 The samples were not random samples. 0 The sample sizes were both too small. 0 Both samples suffered from non-response bias