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【单选题】
一种海洋蜗牛产生的毒素含有多种蛋白，将其中一种注入老鼠体内后，可以使只有两星期大的或者更小的老鼠进入睡眠状态，而使大一点的老鼠到处寻找藏身之处。当老鼠受到突然的严重威胁时，非常小的那些老鼠的反应是完全静止不动，而大一些的会逃跑。以上陈述的事实最有力地支持了下列哪项假设?
A.
老鼠对突然出现的严重威胁作出反应，是由于受到体内产生的一种化学物质的刺激，这种化学物质和注射入老鼠体内的蛋白质相似。
B.
蜗牛毒素中含有的注入老鼠体内的那种蛋白质的常见主要功能是通过促使蜗牛完全不动来保护它。
C.
注入老鼠体内的蛋白质，如果向成年的老鼠体内注射更大的剂量，也能使成年老鼠进入睡眠状态。
D.
幼鼠遇到突发性的严重威胁情况的可能性和大老鼠差不多。
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