The correct answer is option 2, Kenya. The Equator is an imaginary line that runs horizontally around the Earth, dividing it into the Northern Hemisphere and the Southern Hemisphere. It passes through several countries, but in this case, it passes through Kenya.

Option 1, Ethiopia, is incorrect. While Ethiopia is located near the Equator, the line itself does not pass through the country.

Option 3, Nigeria, is also incorrect. Even though Nigeria is close to the Equator and experiences a tropical climate, the line does not pass through the country.

Option 4, Sudan, is also incorrect. Sudan is located north of the Equator and the line does not cross through the country.

It is worth mentioning that the Equator passes through a total of 13 countries including Brazil, Ecuador, Colombia, Indonesia, and the Republic of the Congo. However, in this specific question, option 2, Kenya, is the correct answer.