A manager of the credit department for an oil company would like to determine whether the mean monthly balance of credit card holders is equal to $75. An auditor selects a random sample of 100 accounts and finds that the mean owed is $83.40 with a sample standard deviation of $23.65. If you wanted to test whether the mean balance is different from $75 and decided to reject the null hypothesis, what conclusion could you reach?
选项：

A:There is not evidence that the mean balance is $75.;
B: There is not evidence that the mean balance is not $75.;
C:There is evidence that the mean balance is $75.;
D:There is evidence that the mean balance is not $75.