Disposed means to throw something away so D
The variable is the group that was given caffine, because thats what the doctors manipulated. They possibly altered the natural memory of the participants by giving them caffine. A more specific variable could be how much caffine each participant is given and what time are they given it.
Thats hard ask a expert I always do they always answer trust me
Could you provide the statements?
D. Boycott is your answer
The other 3 are all types of people, a group of people, while boycott is an action that is used by people
hope this helps
