Answer:
C. 68% of the data points lie between 10 and 18.
Step-by-step explanation:
The mean minus one standard deviation (14-4 = 10) is ten, and the mean plus one standard deviation (14 + 4 = 18) is 18. Everything withing the first standard deviation of a normal distribution is 68% of the population, two deviations is 95% of the population, and three deviations is 99% of the population. (According to the Empirical Rule)