Answer:
B). Number of distractions; performance scores on the exam
Explanation:
In a psychological experiment, the dependent variable exemplifies the variable which is being tested or examined in an experiment while the independent variable is the one that is manipulated and changes. Independent variable leads to changes in the dependent variable and has a direct effect on it. In the given study, the independent variable is the 'number of distractions' which is directly controlling the dependent variable 'performance scores on the exam'. The study intends to reflect the impact of constant distractions on the performance of students in the exams. Thus, the correct answer is option B.
