Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information. A. Despite the current impressive size of the Ogallala aquifer, the region's climate keeps the rates of water addition very small. B. Although the aquifer has been adding water at the rate of only half a centimeter a year, it will eventually accumulate enough water of fill Lake Huron. C. Because of the region's present climatic conditions, water is being added each year to the aquifer. D. Even when the region experiences unfortunate climatic conditions, the rates of addition of water continue to increase.