## Core Concept
In a "fight and flight" situation, the body undergoes various physiological changes to prepare for immediate action. This response is primarily mediated by the sympathetic nervous system. One of the key changes involves alterations in digestive processes.

## Why the Correct Answer is Right
During a fight and flight situation, blood flow is redirected from non-essential to essential organs. The **digestive system** is considered non-essential at that moment. As a result, there is a decrease in **splanchnic blood flow** (blood flow to the digestive organs) and a reduction in **gastrointestinal motility** and **secretion**. This reduction in gastrointestinal activity leads to a decrease in the **gastrointestinal transit time** and a decrease in digestive enzyme secretion, which can be associated with a decrease in the activity or effectiveness of digestive processes.

## Why Each Wrong Option is Incorrect
- **Option A:** This option would likely increase in a fight and flight situation due to the body's need for rapid energy.
- **Option B:** Similarly, this would increase to provide energy and support immediate bodily functions.
- **Option C:** This could potentially increase as part of the stress response, helping to provide energy.

## Clinical Pearl / High-Yield Fact
A classic clinical correlation is that stress and the fight-or-flight response can exacerbate or trigger conditions like irritable bowel syndrome (IBS) due to changes in gut motility and sensitivity.

## Correct Answer: D.