Explanation

Mountain systems are classified into fold, block, or volcanic types based on their tectonic origin and geological structure. Evaluating them requires matching each range with its actual geographic continent and structural type.

* Vosges: Located in Europe (eastern France along the Rhine rift valley). It is a classic block mountain (horst) formed through faulting and tectonic rifting, rather than folding.

* Alps: Located in Europe (stretching across central-southern Europe). They are young fold mountains formed by the ongoing tectonic collision between the African and Eurasian plates.

* Appalachians: Located in North America (eastern United States and Canada). They are ancient fold mountains originating during the Paleozoic era and later heavily sculpted by erosion.

* Andes: Located in South America (along the entire western margin). They are young fold mountains created by the subduction of the Nazca plate beneath the South American plate.

Since only the Appalachians (Row 3) and the Andes (Row 4) were correctly matched in the given question:

Therefore, only two of the given pairs are correctly matched.

Hence, Option (b) is the correct answer.