单选题 An analyst does research about sampling and estimation and gathers the following information about the performance of a sample of funds from each of three different categories of mutual funds:

Sample	Population Standard Deviation	Sample Mean	Sample Size
Category 1	15%	9.9%	40
Category 2	16%	10.3%	50
Category 3	19%	8.7%	65

The smallest standard error of the sample mean is associated with the sample from:
A. Category 1.
B. Category 2.
C. Category 3.