In a sample of 12 kids, their mean time on the internet on the phone was 3.9 hours with a sample standard deviation of 0.7 hours. Which distribution would be most appropriate to use?

A. z distribution as the standard deviation always represents the population

B. Neither z nor t, as the population is not known to be normally distributed and there is a small sample

C. t distribution as the population is not normally distributed

D. t distribution as the data are assumed to be normally distributed