The oxygen evolved during photosynthes is comes from water molecules. Which one

The oxygen evolved during photosynthes is comes from water molecules. Which one of the following pairs of elements is involved in this reaction?

(a) Manganese and Potassium
(b) Magnesium and Molybdenum
(c) Magnesium and Chlorine
(d) Manganese and Chlorine

Manganese and Chlorine

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