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The answer depends on the variables in the graph! In a graph of age against mass there is nothing that represents acceleration.
a line graph would do the best or you could do the bar graph but it would be a bit longer to do
Line Graph
A key can make it easier to interpret the data sets that each part of the graph represents, especially if there is no room in the graph area for labels.
It is not, if it is a graph of force against acceleration.