The correct option is Choropleth map.

A Choropleth map shades geographic areas such as countries states or counties according to a numerical value so it directly shows how a value differs in proportion across a region. This makes it the standard choice when you need to visualize regional proportions on a map.

The Treemap displays hierarchical proportions using nested rectangles and does not map values to geographic regions so it is not appropriate for showing regional differences on a map.

The Line chart is used to show trends over time or ordered categories and it does not represent spatial areas so it cannot show proportional differences across regions.

The Scatter plot plots points to show relationships between two numeric variables in Cartesian space and it is not used to shade or color geographic regions by value.

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