现在电视上有一“自热米饭”的广告播的很火，它介绍在食用时，将一无色液体加入到一白色固体中，放上装米饭的盒子，过几分钟米饭马上就热气腾腾，就可以食用了，非常方便．请你推测其白色固体和无色液体可能是如下哪个组合（　　）

A．硝酸铵和水

B．浓硫酸和水

C．氧化钙和水

D．固体酒精和水

An internally efficient security market is most accurately characterized as a market in which:（）

A. the cost of a transaction is minimized.

B. an asset’s price reflects all available information about the asset.

C. prices do not change much from one transaction to the next in the absence of new information.