A Researcher Wants to Find Out Whether Gross Motor Coordination

Multiple Choice

A researcher wants to find out whether gross motor coordination is better in the morning or in the afternoon.To measure coordination,participants balance a book on their heads first in the morning and then in the afternoon.What is confounded with the independent variable?

A) Practice is confounded with the time of day.
B) Practice is confounded with participants.
C) The participants aren't matched.
D) There is no confound for the independent variable.