Final answer:
Creep is a universal geological phenomenon that refers to the slow movement of soil and rock debris downhill, which occurs in any sloped terrain globally, not just in specific environmental conditions.
Step-by-step explanation:
The process of creep is a geological phenomenon that refers to the very slow, continuous, and imperceptible downhill movement of soil and rock debris. This gradual soil movement can affect any sloped region under the influence of gravity, and it's exacerbated by factors such as soil moisture, vegetation weight, and seasonal freeze-thaw cycles. Contrary to being confined to a specific environment like the desert, tundra, mountains, or the tropics, creep is a universal process that can occur in any area with sloped terrain, assuming the conditions permit soil movement.
Therefore, the correct answer to the question 'The process of creep works ________.' is A) universally. It is a widespread phenomenon that can be observed across various geographical landscapes and is not exclusive to a singular type of ecological region or climate zone.