Stress can cause damage to the stomach by increasing the amount of stomach acid, which can lead to ulcers decreasing a person’s appetite, which leads to less food in the stomach and increased danger of infection increasing a person’s appetite, which can overload the stomach disrupting the blood flow through the digestive system, which can lead to ulcers

Correct
First option is the correct one.
( Increasing the amount of stomach acid, which can lead to ulcers decreasing a person’s appetite, which leads to less food in the stomach and increased danger of infection )

Digestion is controlled by a system of millions of nerves. Under stress this entire system is affected. When the nervous system is under stress, the process of digestion slows down. This leads to an increase in the amount of stomach acid. The increased amount of stomach acid can cause ulcers, thereby, reducing the appetite of the person and this overall process can result in infections.

Is this used on a test? ?