Question

the ________ mountains are a series of mountain ranges that run throughout mexico.
a. sierra madre
b. patagonian
c. andes
d. rio de la plata

Explanation:

The Sierra Madre is a series of mountain ranges in Mexico. The Patagonian region is in South - America's southern tip, the Andes run through several South American countries, and the Rio de la Plata is a river - estuary system.

Answer:

A. Sierra Madre