Over Time,dissolved Magnesium Concentration in a Lake Has Reached Equilibrium

Over time,dissolved magnesium concentration in a lake has reached equilibrium.Input is from streams draining into the lake; magnesium is removed by precipitation in lake sediments.If wastewater discharge upstream doubles the rate at which magnesium is delivered to the lake,

A) The BOD of the lake will double.
B) The BOD of the lake will be cut in half.
C) The residence time of magnesium in the lake will double.
D) The residence time of magnesium in the lake will be halved.

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