Final answer:
The source of the Amazon River is close to the Andes mountain range, which is the correct answer for this geographical question.
Step-by-step explanation:
The source of the Amazon River is located close to the Andes mountain range. This vast river system, with a network of over 1,100 tributaries, begins as a glacial stream high in the Peruvian Andes, just 150 miles from the Pacific Ocean. The Andes Mountains, stretching 5,000 miles along the western edge of South America, are not only the longest mountain chain on Earth but also the highest in the Americas, with peaks reaching over 20,000 feet. The Amazon River, known for its enormous drainage basin in the largest tropical rainforest in the world, is one of the longest rivers in the world and has the highest water discharge, carrying about one-fifth of all river water on the globe. Therefore, the correct answer to the question is 'b. Andes', as the source of the Amazon River is found near this mountain range, not the Himalayas, Rockies, or Cascades.