B. The Sahar desert. The people from the south east of the continent migrated to other parts of Africa but not north Africa because the Sahara was in their way. This led to the ottomans to easily lay claim to North Africa and develop a Islamic and Arabic like culture.
The correct answer is option C. hope this helps
Subtropical, it's a zone located between tropic of cancer and temperate zone. it's also present on southern Hemisphere, in this case its between tropic of capricorn and 38th parallel.