The correct answer is Nigeria.

• Nigeria is the most populous and oil-rich country in Africa.
• The major oil producers in Africa include Nigeria, Angola, and Gabon.
• Nigeria:
  • ​It is an African country on the Gulf of Guinea.
  • It has many natural landmarks and wildlife reserves.
  • Protected areas such as Cross River National Park and Yankari National Park have waterfalls, dense rainforest, savanna, and rare primate habitats.
  • One of the most recognizable sites is Zuma Rock, a 725m-tall monolith outside the capital of Abuja that’s pictured on the national currency.

• Kenya:
  • It is a country in East Africa with a coastline on the Indian Ocean.
  • It encompasses savannah, Lakelands, the dramatic Great Rift Valley, and mountain highlands.
  • It is predominantly Muslim Swahili cities such as Mombasa, a historic center that has contributed much to the musical and culinary heritage of the country.
• Sudan:
  • It​ is a country in Northeast Africa.
  • It is bordered by Egypt to the north, Libya to the northwest, Chad to the west, the Central African Republic to the southwest, South Sudan to the south, Ethiopia to the southeast, Eritrea to the east, and the Red Sea to the northeast.
• Uganda:
  • It ​is a landlocked country in East Africa whose diverse landscape encompasses the snow-capped Rwenzori Mountains and immense Lake Victoria.