According to paragraph 6, which of the following statements about aquifers in deserts is true? A. Water from limestone and sandstone aquifers is generally better to drink than water from sand and gravel aquifers B. Sand and gravel aquifers tend to contain less groundwater than limestone or sandstone aquifers C. Groundwater in deep aquifers is more likely to be recharged than groundwater in shallow aquifers D. Sedimentary rocks, because they are porous, are not capable of storing large amounts of groundwater