Lake Chad, on the border of the Sahara Desert,
A. was originally a glacier that melted and so the water supply is dwindling.
B. is a shrinking, shallow-water lake, depleted both by withdrawals for irrigation and by lack of recharge during a multi-decade period of declining rainfall.
C. is a good analogy to Lake Erie, in that it has undergone extensive rehabilitation after being severely polluted and is now a healthy water source.
D. is the last surviving deep-water lake in Africa and represents an important and stable water source for Chad, Niger, Nigeria and Cameroon.
Answer: B
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