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. Transported parent materials, parent materials derived in place from bedrock, and various kinds of rocks all contribute to the composition of a soil. B. The chemical composition of a soil is ultimately determined by the geological materials from which it forms, regardless of where or how the parent material originates. C. The parent material from which a soil is formed ultimately comes from igneous, sedimentary, and metamorphic rocks. D. The composition of the geological materials from which the parent material was originally derived can be determined by studying the chemical composition of the soil.