To Be Able to Conduct an Analysis in SPSS It

To be able to conduct an analysis in SPSS it is important that the independent and dependent variable(s) are measured on the right scale.Which of the following statements is correct when you want to conduct an independent samples t-test?

A) The independent and dependent variable(s) must all be measured on an interval/ratio scale.
B) The independent and dependent variable(s) must all be measured on a nominal/ordinal scale.
C) The independent variables must be measured on an interval/ratio scale,and the dependent variable must be measured on a nominal/ordinal scale.
D) None of the above statements is correct.