Consider the following countries:I.BoliviaII.BrazilIII.ColombiaIV.EcuadorV.ParaguayVI.Venezuela Andes mountains pass throughhow many of the above countries?

1. A

   Only two

   Only two. Four Andean states are in the list.

2. B

   Only three

   Only three. Under-counts Venezuela or Ecuador.

3. C

   Only four

   Only four. Andes run through Venezuela, Colombia, Ecuador and Bolivia. Brazil and Paraguay are not Andean.

4. D

   Only five

   Only five. That would need a fifth name that is not on this list (Chile/Argentina are absent).

Summary. Official Set A key is (c) only four. In this list the Andes pass through Venezuela, Colombia, Ecuador and Bolivia. Brazil is the Amazon-plate country; Paraguay is interior Southern Cone. Four, not five.