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.

The answer would be a

You did not show us the image of the burger, but i shall try to answer as best i can.  when purchasing food, always consider the ingredients as well as the person who prepared it. consider if they were hygienic people or not, in case the burger was infected with bacteria. no mortal should place an infected burger into their mouth.