a newspaper editorial argues that only individuals, and those who know them personally, can identify whether their use of drugs and alcohol is abuse. what is the main reason that this view can be considered valid?

a. users are the only ones who suffer from their abuse
b. governments have not studied substance abuse
c. the definitions of substance abuse can vary widely
d. many people can abuse substances with no ill effects

c. the definitions of substance abuse can vary widely

The main reason this view can be considered valid is that the definition of substance abuse can be subjective and can vary from person to person. What may be considered abuse by one individual may not be seen as such by another. Therefore, it is important for individuals and those who know them personally to identify and address any potential substance abuse issues.