You observe that classmates who get good grades tend to sit toward the front of the classroom, while those who receive poor grades tend to sit toward the back. what are three possible cause-and-effect relationships for this nonexperimental observation?

1.Students at front rows will have to sit attentive and have to concentrate on the lecture being delivered,thus their knowledge about the lecture is way better than the students at back rows.

2. Front row students are more in line with the teacher and they have much better concepts regarding the lecture delivered and they have more score in exams.

3. Generally the more interested a student is about the lectures being delivered,the more front he/she is in classroom and thus this results in more grades.