Suppose We Have Randomly Sampled Data from Five Provinces on Work

Suppose we have randomly sampled data from five provinces on work days missed due to illness in the past year. If the null hypothesis is true, what would be true about the data?

A) Mean value of days missed should be roughly equal across the five provinces.
B) Each province should have a markedly different score.
C) The sample standard deviation values from each province would be identical.
D) Each province sample would be exactly the same size.