65. Correctly measuring the productivity of service workers is complex. Consider, for example, postal workers: they are often said to be more productive if more letters are delivered per postal worker. But is this really true? what if more letters are lost or delayed per worker at the same time that more are delivered?
The objection implied above to the productivity measure described is based on doubts about the truth of which of the following statements?
(A) Postal workers are representative of service workers in general. (B) The delivery of letters is the primary activity of the postal service. (C) Productivity should be ascribed to categories of workers, not to individuals. (D) The quality of services rendered can appropriately be ignored in computing productivity. (E) The number of letters delivered is relevant to measuring the productivity of postal workers.
The question can be better understood in this way: By doubting which of the following statements, the author questioned the measure of productivity (more productive if more letters are delivered)?
也就是说,作者反驳这种measure of productivity,也即 more productive if more letters are delivered,是基於他对於以下那个论点的怀疑呢?