Given the Following Design, Identify the Most Probable Example of the Study

Given the following design, identify the most probable example of the study from the options below. E X₁ O
C X₂ O

A) Ned examines how fourth graders who were provided after school homework help and those who were not on the end of year mathematics test.
B) Ned describes the typical mathematics standardized test that fourth graders are required to take in his state.
C) Ned compares how fourth graders given either after school homework help via the phone or the Internet perform on the end of year mathematics test.
D) Ned examines how the amount of homework help available after school relates to performance on the end of year mathematics test.