Kelly's insistence that a construct is an either/or proposition is reflected in which corollary?

The correct choice is rooted in Kelly's assertion that constructs are fundamentally about making distinctions between different experiences or observations. The Dichotomy Corollary specifically emphasizes that each construct is defined by two mutually exclusive positions; it operates based on the premise that for any situation or set of experiences, individuals will classify and interpret based on these contrasting categories. By adhering strictly to this either/or framework, the Dichotomy Corollary showcases how individuals make sense of the world through polarized views, facilitating decision-making and understanding through clear distinctions. This principle is foundational to Kelly's Personal Construct Theory, underpinning the way people perceive and interact with their environments.