题目选项分析

In comparison to the standard typewriter keyboard, the EFCO keyboard, which places the most-used keys nearest the typist`s strongest fingers, allows faster typing and results in less fatigue. Therefore, replacement of standard keyboards with the EFCO keyboard will result in an immediate reduction of typing costs.

Which of the following, if true, would most weaken the conclusion drawn above?

【选项】The more training and experience an employee has had with the standard keyboard, the more costly it is to train that employee to use the EFCO keyboard.