Whenever ISIS carries out a new atrocity, whether it's beheading a group of Egyptian Christians or enslaving Yazidi women in Iraq or burning its victims alive, the big question most people have is: Why on Earth is ISIS doing this? What could possibly be the point? Adding to your list of enemies is never a sound strategy, yet ISIS' ferocious campaign against the Shia, Kurds, Yazidis, Christians, and Muslims who don't precisely share its views has united every ethnic and religious group in Syria and Iraq against them. ISIS is even at war with its most natural ally, al Qaeda in Syria. The Nazis and the Khmer Rouge went to great lengths to hide their crimes against humanity. Instead, ISIS posts its many crimes on social media for global distribution with seemingly no thoughts for the consequences.
Before the arrival of new trainer, the sales output in AMS learning system Ltd. had been rising by 20% per year on the average over the past ten years. However, after new training innovations by the trainer (which included computerization of training processes and reduction in the need for additional work force) annual sales output has only risen by 10% this year. It appears that Joe's innovation has caused the reduction in the annual growth rate.
Which of the following, if true, would most seriously weaken the conclusion above?

Options

A. (a) The investment in computerization has a provision for depreciation of the cost of the computers
B. (b) Increases in selling price did not follow increases in the cost of the inputs
C. (c) The innovation brought in by the new trainer were intended as long term investments and not made for short term profit growth
D. (d) General demand for the training provided by the company has declined