Emma's Research on Middle Age Uses the Life-Stage Perspective

Emma's research on middle age uses the life-stage perspective. Which of the following best describes this perspective?

A) Development is a lifelong process, multidirectional, and consists of both positive and negative changes, including gains and losses.
B) Overall, older parents and their adult children remain emotionally linked as children leave home, cohabit, marry, and are employed.
C) Development proceeds through a fairly set pattern of sequential stages that most people experience, and these stages are nearly universal and age-linked.
D) Age-related transitions that are socially produced, socially recognized, and shared; they are related to social structure, historical forces, and culture.
E) The sex ratio of middle-age adults is skewed.