Answer: Option C
Step-by-step explanation:
The experimental procedure will consists of several steps that will include eating pizza for some days, not eating pizza for some days, eating different favors to see that whether a single type of pizza is causing heartburn or all the different flavors are doing the same to the body of the person.
A person will eat each kind of pizza for 3 days and after that the flavor will change.The same person will also not eat pizza for 3 days to see the effect.
hence, option C is the correct option.