If I Wanted to Conduct an Experiment on the Effect

Multiple Choice

If I wanted to conduct an experiment on the effect of caffeine consumption on memory scores, what types of data would I need to collect for my independent (IV) and dependent variable (DV) ?

A) IV = Nominal & DV = Continuous
B) IV = Nominal & DV = Nominal
C) IV = Continuous & DV = Nominal
D) IV = Continuous & DV = Continuous