Every family should have a budget. A “budget” is a method of planning expenses by figuring out how much money is made and how much should be spent for everyone’s basic needs. The ordinary expenses in a budget usually include education for the children, monthly bills for the utilities of electricity and water, communication costs for telephone and computer use, transportation costs, and, of course, money for groceries. A little money for extra expenses should also be set aside each month. Since everyone in the family is involved, everyone, even children, should learn to keep the costs of living at a reasonable level. 【題組】49. According to the passage, money to be spent for groceries is best considered _____.
(A)an extra expense (B)a transportation cost
(C)a basic necessity (D)a communication fee