Which statement about brain usage is supported by the material?

• A. We use all of our brains
• B. Only a small portion is used
• C. The brain uses 20% of energy and 2% of body mass
• D. The brain uses half of the body's energy

Answer: (A)

The main idea is that brain activity is distributed across many regions, not confined to a single small area. The material shows that different tasks recruit different networks, and even at rest the brain remains active across broad regions. Over time, this means essentially all parts of the brain participate in functioning, so the statement that we use all of our brains is the best-supported view. The notion that we use only a small portion is a common myth, and fixed percentages of energy or body mass oversimplify how the brain operates.