In an experiment to estimate the volume of air in a soil sample using a measuring cylinder, it was found that:
initial volume of water .... = p cm₃
volume of soil before mixing with water = q cm₃
Final volume of water after adding soil = r cm₃
From the data above, which of the following deductions is correct?

A. r = p + q  
B. r > p + q
C. q = r - p
D. r < p + q

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Correct Answer: A