What statement best explains the meaning of the shape of the Radon 222 curve in Figure 1 and the Mercury 206 curve in Figure 2?
A. The rate of decay is erratic.
B. The rate of decay starts off slowly and then speeds up.
C. The rate of decay occurs very quickly at first and slows as the number of atoms is reduced.
D. The rate of decay occurs at a steady rate over time.

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A. 9.0 8.0 7.0 6.5 6.0 5.0 4.0 0.5 200mg/L Alkalinity solution 1.0 1.5 2.0 2.5 3.0 Added acid (mL) B. Figure 1 9.0 8.0 7.0 6.5 6.0 5.0 4.0 0.5 0 Alkalinity solution 1.0 1.5 2.0 Added acid (mL) 2.5 3.0