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?

• I. Bolivia — The Andes clearly pass through Bolivia. Correct.
• II. Brazil — The Andes do not pass through Brazil. Incorrect.
• III. Colombia — The Andes pass through Colombia. Correct.
• IV. Ecuador — The Andes pass through Ecuador. Correct.
• V. Paraguay — The Andes do not pass through Paraguay. Incorrect.
• VI. Venezuela — UPSC treats the Andes as ending in Venezuela as well; the Cordillera de Mérida is an Andean extension. Correct.

Thus, the Andes pass through Bolivia, Colombia, Ecuador, and Venezuela = 4 countries. Hence, (c) Only four.