Final answer:
During midlife, individuals often see an increase in crystallized intelligence and emotional intelligence, but fluid intelligence, which includes problem-solving and perceiving complex relationships, typically declines in late adulthood, not midlife(option b).
Step-by-step explanation:
The question asks which aspect of intelligence does not typically see gains in midlife. During midlife, individuals often experience an increase in crystallized intelligence and emotional intelligence. Crystallized intelligence involves the use of knowledge and skills that have been accumulated over time, while emotional intelligence relates to the ability to understand and manage emotions. However, gains in fluid intelligence and working memory are not typically observed; in fact, fluid intelligence, which encompasses the ability to see complex relationships and solve problems, often begins to decline in late adulthood.
Therefore, the correct answer to the question is 'B. Fluid intelligence', as it is characterized by the ability to solve problems and perceive complex relationships, and this type of intelligence typically begins to decline in late adulthood, not midlife.