Final answer:
In midlife, cognitive decline is not inevitable and uniform across all individuals. Wisdom and expertise tend to increase during midlife. Midlife is often characterized by the development of a more balanced perspective.
Step-by-step explanation:
In midlife, cognitive decline is not inevitable and uniform across all individuals (Option A). While there may be some changes in cognitive abilities, such as declines in fluid intelligence (Option D), research suggests that wisdom and expertise tend to increase during midlife (Option B). Additionally, midlife is often characterized by the development of a more balanced perspective (Option C). Adults who engage in mentally and physically stimulating activities may experience less cognitive decline and have a reduced incidence of mild cognitive impairment and dementia (Hertzog, Kramer, Wilson, & Lindenberger, 2009; Larson et al., 2006; Podewils et al., 2005).