Which of the following situations ‘A’ or ‘B’ is advantageous for absorption of water and minerals? Why?

Which of the following situations ‘A’ or ‘B’ is advantageous for absorption of water and minerals? Why?
Situation ‘A’ : Growth and branching of roots in the C-horizon.
Situation ‘B’ : Growth and branching of roots in A and B-horizons.

Answer:

Situation ‘B’ is advantageous to plants because A and B-horizons are rich in water, minerals and humus.