What is a sankey graph?

A visualization that represents the flow of data or resources between different entities. It uses arrows of different widths to show the quantity or proportion of flow between nodes.
A visualization that’s divided into sectors, or “slices,” to represent categorical data. Each slice corresponds to a specific category or group, and the size of each slice represents the proportion or percentage that category contributes to the whole.
A visualization that uses line segments to display trends and changes over time. It is a powerful visualization tool used to analyze and understand the relationship between variables.
A visualization that displays the magnitude and changes in values over time. It is similar to a line chart but adds an area below the line to fill the space between the line and the x-axis.

The correct answer is:

A visualization that represents the flow of data or resources between different entities. It uses arrows of different widths to show the quantity or proportion of flow between nodes.