A nurse is educating a group of clients about addiction. The nurse should include that which of the following factors increases the potential for addiction?

A. Medical insurance availability for substance use disorder treatment: This does not increase addiction risk; instead, it improves access to treatment. B. The developing brain is exposed to substances at an early age: Early exposure to substances increases addiction risk because the developing brain is more susceptible to chemical changes caused by drugs or alcohol. C. Initial use of substances began in adulthood: Addiction risk is lower when substance use begins in adulthood compared to early exposure. D. The brain already has cognitive deficits that cause it to be vulnerable to addiction: While cognitive deficits can complicate addiction treatment, they are not a primary factor in the development of addiction.