Based on Her Review of Relevant Scientific Studies,a Researcher Believes

Based on her review of relevant scientific studies,a researcher believes that there is a relationship between the frequency of a baby's crying and whether it was nursed at set intervals or on a demand schedule.If this belief were tested by experimentally manipulating feeding schedules,the feeding schedule would be called the:

A) independent variable.
B) dependent variable.
C) extraneous variable.
D) control factor.