Assertion (Z): Alluvial soils are regarded the richest soil.<br> Reason (R): The mineral composition in alluvial soils are well broken-up which can be easily absorbed by the root of plants.

A) Both Z and R are true and R is the correct explanation of Z B) Both Z and R are true but R is not the correct explanation of Z C) Z is true but R is false D) Z is false but R is true