Construct a 95% Z-Interval or a 95% T-Interval About the Population

Construct a 95% Z-interval or a 95% t-interval about the population mean. Assume the data come from a population that
is approximately normal with no outliers.
-Fifteen randomly selected men were asked to run on a treadmill for 6 minutes. After the 6 minutes, their pulses were measured and the following data were obtained:
$\begin{array}{rrrrr}105 & 94 & 98 & 88 & 104 \\\hline 101 & 99 & 85 & 84 & 124 \\\hline 122 & 114 & 97 & 101 & 90\end{array}$

A) $( 93.7,107.1 )$ ; we are $95 \%$ confident that the mean pulse rate of men after 6 minutes of exercise is between $93.7$ and $107.1$ beats per minute.
B) $( 94.9,105.9 )$ ; we are $95 \%$ confident that the mean pulse rate of men after 6 minutes of exercise is between $94.9$ and $105.9$ beats per minute.
C) $( 94.2,106.6 )$ ; we are $95 \%$ confident that the mean pulse rate of men after 6 minutes of exercise is between $94.2$ and $106.6$ beats per minute.
D) $( 95.2,105.6 )$ ; we are $95 \%$ confident that the mean pulse rate of men after 6 minutes of exercise is between $95.2$ and $105.6$ beats per minute.