What physical feature connects the different regions of the southern grassland countries of south america?

a. a high windswept plain

s. a long mountain chain

d. a vast rain forest

f. a great river system

l think it might be a. let me

A. a high windswept plain

Explanation:

The pampas of the south Americas are those that are grassland biomes that are formed by the flat and the fertile pins that cover the 300,000 miles from the Atlantic to the Andes mountains have warm summers and cool winter and thus are physical features that connect the different region of the south.

The answer i think is d