Consider the following countries : I. Bolivia II. Brazil III. Colombia IV. Ecuador V. Paraguay VI. Venezuela Andes mountains pass through how many of the above countries?

Option (C) is correct because the Andes mountain range passes through four of the listed countries: Bolivia, Colombia, Ecuador, and Venezuela. Brazil and Paraguay are excluded as the range is strictly confined to the western and northern margins of South America, whereas Brazil occupies the eastern half of the continent and Paraguay consists of central lowlands. This question tests the core concept of regional physiography and the precise territorial extent of major geographical features across South American nations.