Mark Conducts a Study for His Research Methods Class to Determine

Multiple Choice

Mark conducts a study for his research methods class to determine if consuming caffeine causes people to perform better on cognitive tasks. In his study, he gives half of his participants a glass of water and half of his participants a glass of cola and then has them attempt to solve 15 math problems. He finds that people who drink caffeine beforehand solve more math problems than those who drink water beforehand.
Mark decides to conduct a conceptual replication. Which of the following could be in the study to make it this type of replication?

A) Measuring a different group of participants
B) Having participants drink a caffeinated energy drink rather than a caffeinated cola
C) Measuring the same participants 1 week later
D) Having participants complete 10 math problems instead of 15