The lengths of text messages are normally distributed with a population standard deviation of 4 characters and an unknown population mean. If a random sample of 24 text messages is taken and results in a sample mean of 22 characters, find a 95% confidence interval for the population mean. Round your answers to two decimal places.

z0.10	z0.05	z0.04	z0.025	z0.01	z0.005
1.282	1.645	1.751	1.960	2.326	2.576

You may use a calculator or the common z-values above.

Select the correct answer below:

A. (20.66,23.34)

B. (20.10,23.90)

C. (19.90,24.10)

D. (20.40,23.60)