Explanation:

• The Zambezi River is the fourth-longest river in Africa. It flows East towards the Indian Ocean. Its drainage basin covers 1,390,000 km², slightly less than half of the Nile's. Hence, option 1 is correct.
•  The Limpopo River rises in South Africa and flows generally eastward through Mozambique to the Indian Ocean. It crosses the Tropic of Capricorn twice. Hence, option 2 is correct.
• The Yangtze or Yangzi is the longest river in Eurasia, the third-longest in the world, and the longest in the world to flow entirely within one country. It rises at Jari Hill in the Tanggula Mountains of the Tibetan Plateau and flows 6,300 km into the East China Sea (Pacific Ocean). Hence, option 3 is not correct.
• The Nile is a major river in northeastern Africa. It flows into the Mediterranean Sea. The Nile is the longest river in Africa and one of the longest rivers in the world. Hence, option 4 is not correct.