Which of the following would be suitable for a speaker who wants to make a speculation about the future?

A hypothetical example is ideal for a speaker looking to make a speculation about the future because it allows the presenter to create a scenario that illustrates potential outcomes or events that may occur. By using a hypothetical example, the speaker can construct a believable narrative or situation that draws from existing trends or possibilities, helping the audience envisage a future that is not guaranteed but plausible based on current knowledge.

In contrast, logical definitions, factual examples, and operational definitions focus on established facts, concrete information, or specific measurements, which do not lend themselves well to speculation. These types of definitions and examples aim to clarify or demonstrate truths rather than explore possibilities or conjectures, making them less suitable for discussions that venture into future predictions or scenarios.