Use the Given Information to Find the Minimum Sample Size $\mu$

Multiple Choice

Use the given information to find the minimum sample size required to estimate an unknown population mean $\mu$
-How many students must be randomly selected to estimate the mean weekly earnings of students at one college? We want 95% confidence that the sample mean is within $2 of the population mean, and the
Population standard deviation is known to be $60.

A) 3047
B) 2435
C) 4886
D) 3458