Donations of imported food will be distributed to children in famine-stricken countries in the form of free school meals. The process is efficient because the children are easy to reach at the schools and cooking facilities are often available on site. Which of the following, if true, casts the most serious doubt on the efficiency of the proposed process? ['The donation of food tends to strengthen the standing of the political party that happens to be in power when the donation is made.', 'A massive influx of donated food will tend to lower the price of food in the areas near the schools.', 'The reduction in farm surpluses in donor countries benefits the donor countries to a greater extent than the recipient countries are benefited by the donations.', 'Supplies of fuel needed for cooking at the schools arrive there only intermittently and in inadequate quantities.']