Final answer:
A chart provides sufficient information when it includes clear data values, labeled units of measurement, and presents the data in a way that's easily understood. Option b, which expects a chart to answer all possible questions, is not a realistic condition for sufficiency.
Step-by-step explanation:
When a chart provides readers with sufficient information, several key conditions are typically met. Firstly, data values are provided at each point on the chart as needed (option a). This ensures that the viewer can understand the exact quantity or frequency of what's being presented without ambiguity. Secondly, the units of measurement are clearly labeled (option c), which is crucial for proper interpretation of data. Lastly, it's important that readers can quickly grasp the meaning of what the chart is showing (option d), as the primary purpose of a chart is to communicate data visually and straightforwardly.
However, it is unrealistic for a chart to answer all possible questions that a reader might have about the chart data (option b). Charts are typically designed to communicate specific insights and trends regarding a particular dataset. Expecting a chart to answer every possible question goes beyond the scope of what a chart is meant to do, as they are tools for summarization, not exhaustive explanation. Thus, option b is not a requirement for a chart to provide sufficient information. In conclusion, options a, c, and d are conditions that are met when a chart provides readers with sufficient information, but option b is not. Therefore, the mention correct option in the final answer excludes option b.