The Width of a Confidence Interval Estimate of the Population

Short Answer

The width of a confidence interval estimate of the population mean widens when the: $\begin{array}{|l|l|}\hline A&\text {level of confidence increases. }\\\hline B&\text {sample size increases. }\\\hline C&\text {population standard deviation decreases. }\\\hline D&\text {Sample mean gets further from the population mean. }\\\hline \end{array}$