Explanation:

- Option 1: U.S.A

- The United States is one of the leading producers of crude oil. It has seen a significant increase due to advancements in shale oil production.

- Option 2: Russia

- Russia is a major player in the global oil market. It has vast reserves and remains one of the top producers.

- Option 3: Saudi Arabia

- Saudi Arabia is known for its massive oil reserves. It's a leading OPEC member with large-scale production capabilities.

- Option 4: Canada

- Canada has significant oil reserves, especially in oil sands, but it produces less than the top three.

- Option 5: China

- China is a major consumer and also produces oil, but not as much as the other top producers.

- Correct Answer: Option 1 - U.S.A

The U.S. is currently the largest producer of crude oil in the world.