What will a burndown chart show if time estimates for tasks are increased during a sprint?

The burndown chart is a visual tool used in Agile to track the amount of work remaining in a sprint. If time estimates for tasks are increased during a sprint, it suggests that the team anticipates needing more time to complete the work. This change in estimation results in an increase in the total remaining work, which would be reflected on the burndown chart.

Instead of showing a decline as work is completed, the chart will display a trend that resembles a burnup chart where the remaining work increases. This upward movement indicates that the total effort needed to complete the tasks has grown, thus demonstrating that the remaining workload has expanded rather than decreased.

The other options reflect different interpretations of how a burndown chart operates. A downward slope typically represents completed tasks, while a flat line or no change suggests that there is no progress being made. In this case, since the estimates have increased, the chart would not remain flat or downward sloping, making the increase in remaining work the correct interpretation.