Through which one of the following groups of countries does the Equator pass?

The Equator passes through 13 countries across three continents. To determine the correct option, we can evaluate each group based on geographical location.

Option A is incorrect because the Equator does not pass through Zambia or Malaysia. Zambia is in Southern Africa, and the Equator passes south of Malaysia through Indonesia.

Option B is correct because all three countries lie on the Equator. In South America, it passes through Ecuador, Colombia, and Brazil. In Africa, it passes through Gabon, Congo, Democratic Republic of Congo, Uganda, Kenya, and Somalia. In Asia, it passes through Indonesia.

Option C is incorrect because it includes Sudan and Malaysia. Sudan is located in North Africa, well above the Equator.

Option D is incorrect because it includes Venezuela and Ethiopia. Venezuela is located in northern South America above the Equator, and Ethiopia is located in the Horn of Africa, also north of the Equator.

Therefore, Colombia, Kenya, and Indonesia is the only group where the Equator passes through every listed country.