It is estimated that the average annual salary for a registered nurse is $46,000 with a standard deviation of $1,800. If 16 random samples of 25 nurses each are randomly selected, the probability that the average salary of one of these samples falls between $45,640 and $46,360 is
A. 0.9986
B. 0.6827
C. 0.1585
D. 0.5763