Area Principle concept Practice Assignment 2: Q10

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Practice Assignment 2: Q10-

The sector-wise division of income of a country for the year 2012 is shown in Figure 2.4.P. Figure 2.5.P represents the combined income of years 2012 and 2013 put together. In order to obey the area principle, the radius of the pie chart in Figure 2.5.P is made twice the radius of the pie chart in Figure 2.4.P. Based on this information, which of the following could be true?

How can we apply area principle across 2 different charts? I don't think size of chart makes any difference as long as the items under the chart are proportionate and are principal is applied within the chart. I could not find any reference in lectures, books or articles which says we can apply area principle across charts. If this is accepted practice, could you please provide reference?