Final answer:
The Environmental Domain refers to the external conditions and influences affecting an individual, and is key in understanding how development is shaped across the lifespan.
Step-by-step explanation:
The domain that refers to a variety of interrelated conditions that are within and surrounding the client is the c) Environmental Domain. This domain encompasses all external conditions and influences that affect the individual, including social, cultural, and physical environments. Developmental psychologists recognize that development is influenced not only by the individual's inherent attributes but also by their interaction with the environment. Environmental factors are crucial in shaping behavior and response to information, as they can affect development across the lifespan.