DrJohnson Hypothesizes That NutraSweet Reduces Short-Term Memory

Dr.Johnson hypothesizes that NutraSweet reduces short-term memory.In order to test her hypothesis she gives 10 subjects a beverage containing NutraSweet (treatment group) and 10 subjects a beverage without NutraSweet (control group) .She then measures the subject's ability to recall a list of numbers.In this study the independent variable is _______and the dependent variable is______.

A) whether the subjects received NutraSweet or placebo: recall for a list of numbers
B) recall for a list of numbers: whether the subjects received NutraSweet
C) the subjects ability to recall: the drink with NutraSweet
D) Both b & c
E) None of these