An experiment is designed to compare the average salaries of employees in a particular position in two competing companies. The null hypothesis is assumed to be that there is no difference in the average salaries of employees in a particular position in the two companies. What is the alternative hypothesis?

A. There is a difference in the average salaries that is equal to the standard deviation.

B. There is no difference in the average salaries.

C. There is a difference in the average salaries.

D. The average salaries are equal.