Which of the Following Statements About Nonparametric Methods Is Correct

Which of the following statements about nonparametric methods is correct?

A) Nonparametric tests are only used in cases where parametric tests such as t or F do not exist.
B) Nonparametric tests should always be used when one is available, because they are easier to apply then their parametric counterparts.
C) Nonparametric tests are useful alternatives to parametric tests such as t or F when certain assumptions required by parametric tests are violated.
D) Nonparametric tests are only used if the data come from independent samples.