Sapna Is Interested in the Influence of Nutrition on Reaction

Multiple Choice

Sapna is interested in the influence of nutrition on reaction time. She assigns participants to eat a salad and fruit for dinner every day for a week or to eat fast food each day. She then brings participants into the lab and asks them to push a button on a keyboard as fast as they can every time they hear a particular sound. What are the operational definitions of the variables in Sapna's study?

A) nutrition; reaction time
B) nutrition; whether participants eat a salad or fast food
C) whether participants eat salad or fast food; how quickly they push the button when they hear the sound
D) whether participants eat salad or fast food; reaction time