An organized cluster of knowledge about a particular object or event is called a: A. semantic network. B. conceptual hierarchy. C. schema. D. retrieval cue.

First, let's understand the meanings of each term: A. Semantic Network: It is a representation of concepts and the relationships between them, often depicted as a graph with nodes (representing concepts) and edges (representing relationships). B. Conceptual Hierarchy: It is an organization of concepts in a hierarchy or a tree structure, where higher-level concepts encompass lower-level concepts. C. Schema: It is a cognitive framework or organized cluster of knowledge that helps us organize and interpret new information. D. Retrieval Cue: It is a hint or a trigger that helps in recalling a memory or information from the long-term memory.

Now, let us match the definition given in the question, i.e., "an organized cluster of knowledge about a particular object or event" with the correct term: A. Semantic Network: It is a representation of relationships between concepts, not specifically about a particular object or event. B. Conceptual Hierarchy: It organizes concepts hierarchically, but it's not necessarily focused on a specific object or event. C. Schema: It provides an organized cluster of knowledge, which can be about a particular object or event. This fits the definition given in the question. D. Retrieval Cue: It helps in recalling information, but it is not an organized cluster of knowledge. Based on the understanding of each term, we can conclude that the correct answer is: C. Schema