In this question, we are given two lists, List I and List II, with countries and their corresponding regions. We need to match the countries in List I with the correct regions in List II.

List I:

A. Veld

B. Llanos

C. Downs

D. Pampas

List II:

1. Argentina

2. Australia

3. South Africa

4. Venezuela

Now let`s look at the options provided:

Option 1: A-3, B-4, C-2, D-1

According to this option, Veld (A) belongs to South Africa (3), Llanos (B) belongs to Venezuela (4), Downs (C) belongs to Australia (2), and Pampas (D) belongs to Argentina (1).

This option correctly matches the countries with their corresponding regions from List II.

Therefore, the correct answer is option 1: A-3, B-4, C-2, D-1.