The answer is A. When the baby yawns, the baby is not experiencing stress.
Clotting will end up being an issue. The cells inside of the arterial wall are being blockaded by the deposit, therefor regular blood flow cannot circulate as its supposed to.
Homeostasis is maintained by sweating because it helps the human body cool down when it is warmer than its normal healthy temperature. The water sweating puts on the skin absorbs a large amount of heat from the body as it evaporates. Hope this helps.