Marcus Has Been Studying for the First Test in His

Marcus has been studying for the first test in his calculus course. He was feeling confident about it until his instructor mentioned that it would be a machine-scored test. Although he knows the material, he is concerned that he might make a mistake filling out the Scantron form and wind up with a bad grade. As he fills out the Scantron form for his calculus test, Marcus should

A) show his work alongside each answer on the Scantron form.
B) draw an "X" through the bubble if he accidentally chooses the wrong answer.
C) make sure the number on the form corresponds with the number of the test item.
D) be careful not to fill the bubble in completely when answering a question.