The correct answer is: "B - horizons or "C-horizons" .
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→ primarily "B-horizons"
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If there are answer choices, and there is an answer choice of:
"B-horizons or C-horizons" ; then choose this.
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If there are answer choices of: "select all that apply" :
then select both: "B-horizons" ; and: "C-horizons" .
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If there is an answer choice that incorporates:
"Both: "B-horizons" and "C-horizons" are correct" ;'
then choose that one.
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If you can only choose one, then choose: " B-horizons " .
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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:
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O-horizon (top soil)
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A- horizon
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E-horizon (included in some cases).
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B- horizon (lots of nutrients).
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C horizon (may be rocky or sandy).
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Hope this helps!
Best wishes!
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