The is the complex organ that enables people to complete many actions and processes. a. heart b. brain c. spinal cord d. nervous system

B. brain

The brain is the complex organ that enables people to complete many actions and processes.

Explanation:  

The brain refers to the most important organ in the human body. It controls human thoughts, memory and speech, movement of the arms and legs, and the function of many organs in the body. It also controls and coordinates actions and reactions which enables human to think and feel and to have memories and feelings. It gets or receives signals from the body's sensory organs and outputs information to the muscles. The brain of human is the largest brain of all vertebrates in relative to body size.

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its b i just took the test and i hit a it was wrong