Answer:
The options
A)caffeine – dependent variable
B)word recall – experimental variable
C)caffeine – independent variable
D)word recall – independent variable.
The CORRECT ANSWER IS C)
C)caffeine – independent variable
Explanation:
The term independent variable is referred to as the variable that is not constant, being modified, and is manoeuvred by the researcher. The independent variable is known to influence the dependent variable in a research work, which means any alteration in the independent variable will produce a direct effect on the dependent variable.
In these scenario, the pair that correctly pinpoint a variable in this Research is the caffeine — independent variable.