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In soil rich in moisture content water floods a plant root system. Leaves can retain only a finite amount of water. Excess water i.e xylem sap from the roots is given out through pores or edge of leaves in the form of droplets. This process is called guttation. As this water contains different organic and inorganic substances from the plant it is considered impure. Also, guttation is of universal occurrence. Thus the correct answer is option C.