Answer:
T
Explanation:
Its true because they are the most common.
 
        
                    
             
        
        
        
The factor that makes the football training exercise unsafe is the possibility of dehydration of the players.
<h3>What is a strenuous exercise?</h3>
A strenuous exercise is one that takes a lot of energy from the person that is engaging in it. Being engaged in a strenuous exercise would mean that the person would sweat so much and loose a lot of fluid in the process.
In the course of  strenuous exercise, it is possible for a person to become dehydrated especially on a hot day when the temperature is as high as   81°f and the relative humidity is 80 percent.
This makes it important that these practice sessions must hold at a time when the weather is not extremely hot and so much arrangement must be made to keep the members of the team hydrated throughout the football practice. 
Learn more about dehydration:brainly.com/question/10625552
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A) For  it does not require a life long commitment, and it is not C) because it can be any substance not just tobacco!
Thus your answer is A) gradually but completely withdrawing substances from use !
Have a happy life !
:D <span />
        
             
        
        
        
By countless hours of research and tests