For the following data set, calculate the percentage of data points that fall within one standard deviation of the mean, and compare the result to the expected percentage of a normal distribution. {55, 54, 66, 38, 53, 56, 57, 66, 45, 65}

A.
50%; This percentage is lower than expected in a normal distribution.

B.
60%; This percentage is lower than expected in a normal distribution.

C.
70%; This percentage is close to the expected percentage in a normal distribution.

D.
80%; This percentage is higher than expected in a normal distribution.