Final answer:
Option 1 is evidence in favor of the exemplar theory exclusively, as it aligns with the theory's view that individual experiences with category members shape and change the category's representation over time.
Step-by-step explanation:
The question you're asking pertains to exemplar theory, which is a theory in cognitive psychology about how people categorize objects and concepts. You are seeking to understand which of the provided options serves as evidence exclusively for exemplar theory. The correct answer is option 1: Representations of categories change over a short period with changing experience of category members. Exemplar theory suggests that individuals use specific examples of category members that they have encountered in the past to decide if a new item belongs to a category. This theory implies that more exposure to category members is likely to modify one's internal representation of the category. Because exemplar theory emphasizes the role of individual instances or examples in forming category representations, change over time due to experience aligns with the perspective of this theory.