Read the passage:
'The Chad Basin, an endorheic drainage basin spanning parts of Nigeria, Chad, Niger, and Cameroon, has experienced catastrophic environmental degradation over recent decades. Lake Chad, which once sustained millions through productive fisheries and recession agriculture, has shrunk by nearly ninety percent since the 1960s due to prolonged droughts and diversion of feeder rivers like the Chari and Logone. This shrinkage has catalyzed acute resource competition, displacing pastoralist communities and exacerbating regional insecurity in northeastern Nigeria.'
In one sentence, what is the central thesis of the passage?
Answer and explanation
Correct answer: C. environmental desiccation of Lake Chad has triggered severe social and security crises
- Step 1: Analyze the full passage: It links climatic drying and water diversion to ecological shrinkage and the resulting competition, displacement, and insecurity. Step 2. The thesis is that environmental drying has sparked socio-economic and security crises. Answer: environmental desiccation of Lake Chad has triggered severe social and security crises. Why not the others: Fishing did not become a leading export; pastoralism was disrupted but not eliminated; borders were not redrawn.
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