Which of the following variables highlighted in (parentheses) can be described as a dependent variable?

Group of answer choices

The researcher studied the effect of students' (socioeconomic status) on academic achievement.

The data from the study showed that the timeout procedure was effective in reducing the students' (misbehavior)

It was found that high school GPA was a better predictor of college performance than (SAT scores.)

The teacher was able to increase the number of books read by the students in her class by offering a prize to students who read four books in (one month.)