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The A horizon is the best for plant growth, because is has more organic material and more organisms that make the soil more fertile than the deeper layers, and the soil is not loose like the O horizon.

the A horizon

Topsoil is the uppermost layer of the soil and topsoil is best for plants growth.

What is topsoil?

The uppermost layer of the soil is topsoil.

This layer is made up of humus, living creature, plant roots.

Most of the nutrients are present in this layer.

It betters the condition for plant growth.

Thus, the topsoil is best for plant growth.

Learn more about topsoil, here:

https://brainly.com/question/1933157