How did the condition of Lake Chad change during the previous half millenium, when CO2 levels were almost unchanged? (poll 1093213)

How did the condition of Lake Chad change during the previous half millenium, when CO2 levels were almost unchanged?

A. Lake level remained mostly constant until 1963.

B. Multiple droughts, similar to the late 20th century, caused the lake level to repeatedly drop to extremely low levels.

C. Monsoon rains kept the lake area at 25,000 square kilometers or higher at all times.

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