In the general adaptation syndrome, the fight-or-flight reaction describes the body's immediate reaction upon facing a threatening situation or emergency.

What should be changed to make the above statement true?

It is an incomplete question but the correct answer is: The phrase “fight-or-flight” should be changed to the word “alarm.”

Explanation:

As explained by Hans Selye, General adaptation syndrome, or GAS, is a predicted way by which our body reacts to any stress. Our body responds in three predictable ways, when subjected to stress.

The statement is true. The phrase fight or flight can be replace as the "acute stress" response refers to a psychological reaction one have in the face of danger or threatening situation,this danger can either be physically or mentally ,you can choose to flee or fight.