Is the essential first step in determining the possible causes of addiction for the person and the most appropriate treatment modality for his or her needs.
a. screening
b. assessment
c. intake
d. orientation

b. Assessment

Explanation:

According to my research on the process of rehabilitation, I can say that based on the information provided within the question this essential first step is called Assessment. This is the first step in the rehabilitation process that focuses on assessing the situation and the extent of the addiction in order to formulate a plan and help the patient get rid of his/her addiction and maintain clean.

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answer; genetics;