In the context of links between aging, the brain, and cognitive functioning, which of the following statements is true of older adults?
A. Compared with younger adults, older adults often show less activity in the frontal and parietal lobes of the brain on simple tasks.
B. The functioning of the hippocampus increases to a higher degree than the functioning of the frontal lobes in older adults.
C. Older adults perform better on tasks involving complex reasoning when neural circuits in specific regions of the brain's prefrontal cortex decline.
D. Older adults are more likely than younger adults to use both hemispheres of the brain to compensate for declines in attention.