For the Following Question(s): a Researcher Is Interested in a New

For the following question(s) : A researcher is interested in a new kind of exercise. This new exercise can be done by anyone because it does not require any equipment, and therefore could be potentially beneficial without cost to the person. The researcher is interested in whether this new exercise will reduce the rate of heart attacks in the people who participate in doing it.
-What is the "cutoff on the comparison distribution"?

A) The point at which, assuming the null hypothesis is true, it would be extremely unlikely to get a result this extreme.
B) The point at which, assuming the research hypothesis is true, it would be extremely unlikely to get a result this extreme.
C) The point at which the comparison distribution ends.
D) The point at which you accept the null hypothesis if the result is more extreme.