I'm pretty sure it's D. The stars don't influence the moon's phases.
The heart rate will likely decrease. As the cardiac muscle, or heart, gets stronger, it takes less effort to pump more blood. As a result, the heart will probably beat less, decreasing the heart rate. This is why athletes often have lower heart rates than the average person.
~Hello there! ^_^
Your question: An objects momentum is determined by the object's..?
Your answer: An objects momentum is determined by the object's mass and velocity.
Happy Studying! =)