Answer:
d. an oceanic plate subducted at a low angle beneath the continent
Explanation:
The tectonic event in the western U.S. caused magmatism and deformation to move farther into the continent during the late Mesozoic and early Cenozoic Laramide Orogeny is as a result of an oceanic plate being subducted at a low angle beneath the continent.
Due to the oceanic plate being at a low angle underneath the continent it favoured the release of molten magma.
