In preparing to construct a one-sample t interval for a population mean, suppose we are not sure if the population distribution is Normal. IN which of the following circumstances would we not be safe constructing the interval based on an SRS of size 24 from the population?

A) A stemplot of the data is roughly bell shaped
B) a histogram of the data shows slight skewness
C) a boxplot of the data has a large outlier
D) the sample standard deviation is large.