已知t℃时，某物质的不饱和溶液a g中含溶质m g。若该溶液蒸发b g水，并恢复到t℃，析出溶质m1 g。若原溶液蒸发c g水并恢复到t℃，则析出溶质m2 g。用S表示该物质在t℃时的溶解度，下式中正确的是（ ）
A． |
B． |
C． |
D． |
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