Answer: Colombia is the country that is part of the Northern Tropics of South America.
Explanation: The Northern Tropics, also known as the Tropic of Cancer, is an imaginary line located at approximately 23.5 degrees north of the Equator. This line marks the farthest northward position where the sun appears directly overhead at noon during the summer solstice in the Northern Hemisphere.
Colombia is located in the northern part of South America, and a small portion of the country lies north of the Tropic of Cancer. The majority of Colombia, including its capital city, Bogotá, is located south of the Tropic of Cancer. However, the northernmost regions of Colombia, such as La Guajira and the San Andrés and Providencia islands, are situated north of the Tropic of Cancer.
On the other hand, Bolivia, Peru, and Brazil are all countries in South America, but they are located further south and do not intersect with the Tropic of Cancer. Bolivia and Peru are both landlocked countries, while Brazil is the largest country in South America and is known for its vast Amazon rainforest.
Therefore, the correct answer to the question is Colombia.