A sample is selected from a population and a treatment is administered to the sample. For a hypothesis test with a t statistic, if there is a 5-point difference between the sample mean and the original population mean, which set of sample characteristics is most likely to lead to a decision that there is a significant treatment effect?

a. Small variance for a large sample

b. Small variance for a small sample

c. Large variance for a large sample

d. Large variance for a small sample