To determine in which locations at least half of the people practice Christianity, we analyze the data provided in the table:
- Zimbabwe: 50% practice Christianity.
- Nigeria: 40% practice Christianity.
- Mali: 1% practice Christianity.
- South Africa: 83% practice Christianity.
Based on the data:
- Zimbabwe has exactly 50% practicing Christianity (which qualifies as at least half).
- Nigeria has 40%, which is less than half.
- Mali has only 1%, which is far less than half.
- South Africa has 83%, which is more than half.
Therefore, the locations where at least half of the people practice Christianity are Zimbabwe and South Africa.
The best answer from the choices provided is: C. Zimbabwe and South Africa only.