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The choice that highlights the diversity of family units and their definitions was predominantly addressed in sociological discussions of the 20th century because this period saw significant changes in family dynamics. As society evolved, so too did the understanding of what constitutes a family. Traditional family models, such as the nuclear family, began to be juxtaposed with alternative arrangements, including single-parent households, blended families, and same-sex partnerships.

Sociologists aimed to explore how these variations reflect broader social changes, such as shifts in gender roles, increasing rates of divorce, and the impact of cultural diversity on family structures. This emphasis on understanding the complex, multi-faceted nature of family units allowed sociologists to develop a more nuanced discourse around family life and its various forms in modern society.

In contrast, the other aspects mentioned in the options, while relevant in sociological discussions, did not receive the same level of focus in terms of their implications for understanding family dynamics. The exploration of traditional family structures and the economic implications of family size, for instance, were part of the discussion but did not encapsulate the broader, evolving understanding of family diversity that characterized the sociological discussions of this century.