What does this even mean?!

Four research teams each used a different method to collect data on how fast a new strain of maize sprouts. Assume that they all agree on the sample size and the sample mean (in hours). Use the (confidence level; confidence interval) pairs below to select the team that has the smallest sample standard deviation.

Question

What does this even mean?!

Four research teams each used a different method to collect data on how fast a new strain of maize sprouts. Assume that they all agree on the sample size and the sample mean (in hours). Use the (confidence level; confidence interval) pairs below to select the team that has the smallest sample standard deviation.

anonymous · Answer

A.	Confidence Level: 95%; Confidence Interval: 43 to 47
 		B.	Confidence Level: 68%; Confidence Interval: 44 to 46
 		C.	Confidence Level: 95%; Confidence Interval: 44 to 46
 		D.	Confidence Level: 99.7%; Confidence Interval: 42 to 48