The data markers of the same color in a chart constitute............. 

Data series

The correct answer is option 2- Data series.

Individual values plotted in a chart and represented by bars, columns, lines, pie or various other shapes are called data markers. Data markers of the same colour constitute a data series. The data series are related data points that are plotted in the chart/ graph. Each data series in a chart is shown in a unique colour or pattern or both. Its identification is given by the legend. There may be more than one data series in a chart/graph.