Given the following design, identify the most probable example of the study from the descriptions below.
◦ Susan compares mathematics achievement scores between those students who received after school instruction and those who did not.
◦ Susan describes how fathers and mothers feel about moral education curriculum legislation.
◦ Susan examines the relationship between school violence incidences and number of children in a typical class.
◦ Susan compares self-esteem levels of children who are in ability grouped versus non-ability grouped classrooms.