Which of the following refers to a diagram that represents a tree-like hierarchy?

A diagram that represents a tree-like hierarchy is best described as a dendrogram. Dendrograms are specifically designed to show the arrangement of clusters or groups in a hierarchical format, displaying the relationships between them. They are commonly used in fields like biology for depicting genetic relationships or in data science for representing hierarchical clustering results.

Though flowcharts, hierarchy charts, and mind maps have their uses, they do not fulfill this specific purpose. Flowcharts focus on processes and workflows, illustrating steps in a sequence. Hierarchy charts show different levels of information but are often more linear and organizational rather than tree-like. Mind maps serve to structure thoughts and ideas visually and are more about exploring relationships around a central concept, rather than representing clear hierarchical data structures.

Thus, the term "dendrogram" is the most precise and accurate representation of a diagram showcasing tree-like hierarchies.