The answer is
B) a flowerpot falling from a balcony.
This is the answer because potential energy is basically when something is standing still. Kinetic energy is the opposite, its when something is moving. So the flowerpot was still but something knocked it over and the potential energy was turned into kinetic energy. In option A, the kinetic energy is being turned into potential energy singe the car stopped moving. In option C, the cow is just storing potential energy and it is not being transformed into kinetic energy since the cow is not moving. Option D is not the answer because once again, this says the bike is slowing down, which means that the kinetic energy is decreasing and being turned into potential energy.
Reflexes will be normal.
A reflex is a defense mechanism of the nervous system. It operates below the level of conscious control and permits quick reaction to potentially painful or damaging situations.