Final answer:
The greatest effect of a family member's drug addiction is strained relationships and emotional distress, leading to breakdowns in communication, financial issues, and decreased trust.
Step-by-step explanation:
When a family member is addicted to drugs, the greatest effect on the family is often C) Strained relationships and emotional distress. Drug addiction is characterized by compulsive use of a substance such as a psychoactive drug despite the negative consequences that such use may entail. The impact of addiction on a family can be devastating, leading to a breakdown in communication, financial struggles, and a lack of trust within the family unit. The Depression Strains Many Families section emphasizes the importance of family unity during tough times, yet acknowledges the emotional strain that can lead to disintegration. The literature on addiction, dependence, and rehabilitation supports this by highlighting how the misuse of substances can disrupt family dynamics and become a major source of stress and conflict.