The correct answer is (b), the Appalachians. The Appalachians are a mountain range in eastern North America. They are composed of ancient rocks that were once part of a much larger mountain range that formed during the Ordovician and Silurian periods, about 450 to 400 million years ago. This mountain range was eroded away over time, and the Appalachians that we see today are the remnants of that ancient mountain range.
The Kunlun Mountains are a mountain range in Central Asia. They are part of the Himalayan orogeny, which began about 50 million years ago and is still ongoing. The Alps are a mountain range in Europe. They are also part of the Himalayan orogeny. The Andes are a mountain range in South America. They are the result of the collision of the South American Plate and the Nazca Plate, which began about 200 million years ago.
The Appalachians are not the result of Tertiary orogeny because they were formed much earlier, during the Ordovician and Silurian periods. The other three mountain ranges were formed during the Tertiary period, which began about 66 million years ago.