A Researcher Want to Test If a Cause-Effect Relationships Exists

Multiple Choice

A researcher want to test if a cause-effect relationships exists between someone's age and the number of hours of sleep someone needs.She measures age as follows: 0 < 20 years.
0 20 - 50 years.
0 > 50 years.
Furthermore,participant of the research can fill in the number of hours they sleep on average in a day on a dotted line.
Which test could best be used to test the hypothesis that age influences the number of hours someone sleeps?

A) A independent samples t-test.
B) A paired samples t-test.
C) ANOVA.
D) Discriminant analysis.