Explanation:

- Option 1: Cerrado

The Savanna region of Brazil is indeed called the Cerrado. It's known for its vast, tropical savanna ecosystem. It covers around 21% of Brazil and is rich in biodiversity.

- Option 2: Llanos

The Llanos refer to tropical grasslands found mainly in Colombia and Venezuela, not Brazil. They are characterized by their flat terrain and seasonal wet and dry climate.

- Option 3: Pampas

The Pampas are fertile lowlands located primarily in Argentina and also extend into Uruguay and parts of Brazil. They are known for their rich soil and grasslands ideal for agriculture and cattle ranching.

- Option 4: None of the above

This option is incorrect as the correct term for the Brazilian savanna is Cerrado.