Answer:
The correct options are : C and D
Explanation:
The fertile soil consists of :
O Horizon : This horizon consists of organic layer and it is the topmost layer of the fertile soil
A Horizon : The soil which is considered to lie in this horizon is known as Top soil. This is the primary layer where plants and organism live.
B Horizon : The soil which is considered to be in this horizon is known as Sub soil. This soil is made up of clay, iron and organic matter.
Hence, among the given options The soils which are the layers of fertile soil are : Top Soil and Sub Soil
Therefore, The correct options are : C and D