In Plant Roots, the Casparian Strip Is Correctly Described by Which

In plant roots, the Casparian strip is correctly described by which of the following?

A) It aids in the uptake of nutrients.
B) It provides energy for the active transport of minerals into the stele from the cortex.
C) It ensures that all minerals are absorbed from the soil in equal amounts.
D) It ensures that all water and dissolved substances must pass through a cell membrane before entering the stele.
E) It provides increased surface area for the absorption of mineral nutrients.