Answer :
Answer:
c. flavor of drink and time of consumption.
Explanation:
Since in the question it is mentioned that the students who are in high school consumed different flavors.
Also the bitter drink is best for 6 hours after consuming it and the sweet drink is best for 1 hours after drinking it
Now there is an interaction lies between the variables so it involves the drink flavors and the consumption time as it is directly related to the given situation
hence, the correct option is c.