Answer:
A. Crunches
Explanation:
Crunches are an exercise which you lift your upper back from the ground(or head) in a laying position on your back. This exercises your abdominal muscles, which is around your tummy area.
In a normal human adult, your heart beat will on average be 60-100 beats per minute. However one thing about medicine is that we never treat the numbers but the patient, and there are people who's heart rates can be lower or higher.
Additionally children and infants to tend to have higher heart rates.
I would expect to wait like a week or so, and then go for a test or order one online.