Analyze the graph below and answer the question that follows. A 5-column table with 3 rows. Column 1 has entries Traditional African Religions, Christianity, Islam. Column 2 is labeled Zimbabwe with entries 74 percent, 50 percent, 1 percent. Column 3 is labeled Nigeria with entries 10 percent, 40 percent, 50 percent. Column 4 is labeled Mali with entries 9 percent, 1 percent, 90 percent. Column 5 is labeled South Africa with entries 3 percent, 83 percent, 1 percent.
Data courtesy of the CIA World Factbook

According to the graph above, in which location(s) do at least half of people practice Christianity?
A.
Zimbabwe only
B.
Nigeria and Mali only
C.
Zimbabwe and South Africa only
D.
Zimbabwe, Nigeria, and South Africa only