Final answer:
Africa is the second-largest continent globally, with a wide range of languages spoken. It is the source of the longest river, the Nile, and is home to the largest and hottest desert, the Sahara.
Step-by-step explanation:
Africa is the second-largest continent in the world, next to Asia. Therefore, the answer to the first question is b) Second. Africa is home to a diverse range of languages, with estimates ranging from 1500 to 2000 languages spoken on the continent. So, the answer to the second question is b) 1500-2000. The continent that is the source of the world's longest river is b) Africa. The Nile River, which flows through several countries in Africa, including Egypt and Sudan, is the longest river in the world. Lastly, the world's largest and hottest desert is located in b) Africa. The Sahara Desert, spanning several African countries, holds this record.