A random sample of men from the United States was taken, and their heights to the nearest inch were as follows: 60, 63, 64, 65, 65, 66, 67, 68, 68, 68, 68, 69, 69, 69, 70, 73. Determine the sample mean of the heights first. Which confidence interval could represent the sample results with a margin of error of +/-2 inches?
A. (66, 68)
B. (65, 69)
C. (63, 67)
D. (67, 69)