题目选项分析

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?

【选项】Supplies of fuel needed for cooking at the schools arrive there only intermittently and in inadequate quantities.