The mountain range is located closest to North America’s east coast is the Cascade range Option(a) is correct.
What is a Cascade Range?
The Cascade Range is most popular for its tall volcanoes and profound evergreen backwoods. While the North Cascades contain an incredibly rough group of spiked tops, it is the long queue of cold volcanic cones running from Mount Baker south to Lassen Peak that rule the reach for its whole length.
Fossil and rock attraction studies demonstrate that the North Cascades rock formations were shaped a great many miles south in the Pacific Ocean. Joined to gradually moving plates of maritime stone, they floated toward the north consolidating around quite a while back.
The American adventurers Meriwether Lewis and William Clark, on their campaign toward the northwest in 1806, went through the reach in the 4,000-foot-(1,219-meter-) profound Columbia River Gorge on the Washington-Oregon line. The reach was named for the incredible fountains tracked down close to the canyon.
Therefore Option(a) is correct.
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