Using the Point-and-Figure method what is the standard method used to portray the volume on the chart?

Using the Point-and-Figure method what is the standard method used to portray the volume on the chart?
A . This is to multiply the volume occurring when each box was in operation
B . This is to sum up the volume occurring when each box was in operation
C . This is to divide up the volume occurring by each box was in operation
D . It is, to sum up, the volume that occurs when every box is not in use

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Answer: B