Final answer:
The vulnerable group described in the question is substance abusers who test positive for HIV. Substance abuse and HIV are major risk factors that can significantly impact an individual's health.
Step-by-step explanation:
The vulnerable group described in the question is b. Substance abusers who test positive for HIV. Substance abuse and HIV are both major risk factors that can significantly impact an individual's health. Substance abusers who test positive for HIV are at a higher risk of various health complications and require specialized care to address their unique needs.
For example, individuals who abuse drugs may engage in behaviors such as sharing needles, which can lead to HIV transmission. Additionally, substance abuse can weaken the immune system, making individuals more susceptible to HIV and other infections. As a nurse, it is crucial to provide comprehensive care and support to this vulnerable group, ensuring they have access to appropriate medical treatment and resources.