A company wants to investigate the idea of creating a large oil reserve to stockpile oil in case of a shortage. Based on the results of Experiment 1, which of the following rock types would be the best choice for a storage medium?
A. Limestone
B. Shale
C. Sandstone
D. Granite

Experiment 1
In a laboratory, a scientist wanted to determine the porosity of 4 samples of different rocks. The scientist recorded the mass of the rock samples prior to the experiment. To measure porosity, the samples were soaked in water and the mass of the samples was recorded periodically. A highly porous rock would have a significant increase in mass the longer it soaked in water, eventually reaching the point at which it could no longer absorb any more water (saturation point). The data was recorded in Table 1.

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Time (hr) 0 (starting mass) 2 4 6 12 Porosity (%) Sample (volume of sample cm³) Limestone (33 cm³) 27 g 29 g 30 g Table 1 31 g 32 g 15 Sandstone (27 cm³) 24 g 26 g 28 g 29 g 30 g 19 Shale Pumice (30 cm³) (25 cm³) 25 g 34 g 28 g 30 g 31 g 32 g 23 35 g 36 g 37 B 38 g 12