How are the O and A horizons similar?

Question

They both contain organic material.
They are both very dense layers of soil.
They are both part of the subsoil layer.
They are both found below the B horizon.

Answer 1

The correct statement is: They both contain organic material.

The O horizon (organic horizon) is primarily composed of organic matter, such as decomposed leaves and plant material, while the A horizon (topsoil) also contains organic material mixed with minerals. The other statements are not accurate regarding the characteristics or positions of the O and A horizons in relation to the soil profile.