user
had been lond used for grazing herds, and the soils are fertilized
A: grasslands
B: regosol
C: ectopic pregnancy
D: fertilization
E: bone
assistant
<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

A

<|end_of_solution|>