Which of the following is an example of reasonable inference?

Reasonable inference involves drawing a conclusion based on evidence or observable phenomena. In the context of the choices provided, inferring the presence of fire from visible smoke is a clear instance of reasonable inference because smoke is commonly associated with fire. The appearance of smoke typically indicates that combustion is occurring, making this reasoning logical and supported by well-established principles of cause and effect.

The other options lack the same degree of reliability as they tend to rely more on subjective interpretation rather than observable evidence. For instance, assuming a person's mood based solely on silence may overlook other possible explanations for their demeanor. Similarly, believing a car is fast based solely on its appearance can be misleading, as the design does not necessarily correlate with performance. Assuming someone's wealth based on their attire is also not a foolproof indication, as clothing can vary widely in quality and style regardless of a person's financial status. Therefore, the option regarding smoke leading to the inference of fire is the only one grounded in logical reasoning and observable evidence.