A．food production must be increased
B．fresh water supply must be supervised more carefully
C．the growth of population must be controlled
D．the waste of food and water must be restricted
根据题干中出现的increasetheworld’Sfood supply：和foodproductionwilldecrease，可以判断短文讨论了有关粮食供应方面的话题。
短文主要介绍了水资源在保障粮食供应方面的重要性。
B。本题出题点在推断处(must be)。短文提到，政府官员说为了增加世界的粮食供给，必须对世界淡水供给实行更加认真的监督，由此可知本题选B。
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