Option 1: Gulf Stream - The Gulf Stream is actually a warm current that flows from the Gulf of Mexico along the eastern coast of the United States. It is not a cold current in the Atlantic Ocean.

Option 2: Benguela Current - This is the correct answer. The Benguela Current is a cold current that flows northward along the western coast of southern Africa. It is caused by the strong southeasterly winds that blow along the coast, pushing the warm surface water away and bringing up cold water from the depths of the ocean.

Option 3: Peru Current - The Peru Current, also known as the Humboldt Current, is another cold current in the Pacific Ocean, not the Atlantic Ocean. It flows northward along the western coast of South America, bringing cool waters from the Southern Ocean.

Option 4: Brazil Current - The Brazil Current is a warm current that flows southward along the eastern coast of South America. It is not a cold current in the Atlantic Ocean.

In conclusion, the Benguela Current is the correct answer as it is a cold current in the Atlantic Ocean.