Sheila has been exercising at peak performance for about 60 minutes. She did not hydrate as effectively as she should have and as a result

D. Blood colloid osmotic pressure

Explanation:

Blood colloid osmotic pressure Is also known as Oncotic pressure. It is mostly induced by the protein known as albumin.It displaces water molecules, and there becomes a deficiency in the relative water molecule. When this happens water molecules move back into the circulatory system.

Her Urine is yellow due to the body’s response to dehydration by putting the water back into the circulatory system for use.