What multi-layered outer surface of the cerebrum receives environmental information and aids in complex voluntary movements?

The cerebral cortex is the multi-layered outer surface of the cerebrum that plays a crucial role in processing environmental information and coordinating complex voluntary movements. It is responsible for higher-order brain functions such as perception, cognition, and motor control. The outer layer of the cerebral cortex contains neurons that are involved in processing sensory information from the environment, allowing individuals to respond appropriately to stimuli.

Additionally, the cerebral cortex is divided into various regions that specialize in different functions, such as the motor cortex, which is specifically involved in planning and executing movements. This integration of sensory input and motor output enables complex behaviors and skills, aligning well with the question's focus on voluntary movements.

The other options listed serve different functions within the brain. The amygdala is primarily involved in emotional processing; the thalamus acts as a relay station for sensory information; and the hypothalamus regulates homeostatic functions and the autonomic nervous system, rather than complex voluntary movements. Thus, the cerebral cortex is the most fitting choice in this context.