I believe it's A. Premature Birth (though they all seem pretty believable)
Continual questioning of observations.
Answer: Austyn's heart rate is up quite a bit compared to Shanice which means either he was working out harder or since he's a male he has a larger heart which need more blood through the body. The heart rate is affected by how hard you work out? The size and possibly the condition of your heart?
Explanation:
Rain falling to the ground. water runs downhill and flows toward the sea.