Final answer:
The Hell Creek Formation is found in the Great Plains province of the North Central Region of the US. Therefore , the correct answer options is a)
Step-by-step explanation:
The Hell Creek Formation is a famous geological formation known for its fossil beds and is located in the Great Plains province of the North Central Region of the United States.
While the Central Lowlands are characterized by largely undeformed Paleozoic marine rocks, and the Rocky Mountains are known for their young, tectonically active history.
the Hell Creek Formation is part of the Great Plains province, which is composed of younger Mesozoic and Cenozoic sediments that were primarily eroded from the Rocky Mountains. These sediments have also been shaped by glaciers and rivers post-deposition.