An administrator finds in a local study that 46% of his university's students obtain an undergraduate degree in 4 years of study (based on 400 randomly selected students). Assuming that the national average for students graduating in 4 years is 39% and hat the probability of observing this sample mean of 46% or higher was 0.1, WHAT CONCLUSION can the administrator make ABOUT HIS UNIVERSITY'S GRADUATION RATE?

A-there is not enough evidence to conclude that it is higher than the national average

B-there is enough evidence to conclude that it is lower than the national average

C-the sample size is no large enough to draw any statistical conclusions

D- there is enough evidence to conclude that it is higher than the national average