Question

The amount of water ________ by the United Nations for drinking, washing, cooking and ________ proper hygiene is a minimum of 50 litres per person per day.

strong >Each question below has two blanks, each blank indicating that something has been omitted. Choose the set of words for each blank that best fits the meaning of the sentence as whole.
A recommending, maintaining
B recommendation, maintenance
C recommended, maintaining
D recommend, maintain
E recommend, maintaining
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