Because desert would contain little organic material, their soil profiles have horizons.

The correct answer is:  "B - horizons or "C-horizons" .

           →  primarily "B-horizons"

If there are answer choices, and there is an answer choice of:

        "B-horizons or C-horizons" ;  then choose this.

If there are answer choices of:  "select all that apply" :

   then select both:  "B-horizons" ;  and:  "C-horizons" .

If there is an answer choice that incorporates:

 "Both:  "B-horizons" and "C-horizons" are correct" ;'

    then choose that one.

If you can only choose one, then choose:  " B-horizons " .

Note that:  "B-horizons" and "C-horizons" do not necessary refer to the answer choice, per se .

Rather, as per the U.S.A. soil classification systems,

soil horizons, from the top to the bottom, are generally classfied as:

  O-horizon (top soil)

  A- horizon

  E-horizon (included in some cases).

  B- horizon (lots of nutrients).

  C horizon  (may be rocky or sandy).

Hope this helps!

Best wishes!