Which of the Following Statements Is True About the T-Test

Which of the following statements is true about the t-test?

A) The t-test provides a mathematical way of determining if the difference between two sample means has occurred by chance.
B) The larger the value of the standard error of the difference between two means, the larger the value of t.
C) The t-test cannot be used when the population standard deviation is unknown.
D) In order to conduct a t-test, the sample size should be larger than 30.
E) The t-test cannot be used for interval or ratio data.