Training Program X and Training Program Y were both designed to increase "people skills." Training Program X requires $25\%$ more hours to complete than Training Program Y$.$ Three months after completion of the two Training Programs, the programs were evaluated and found to be equally successful. The developers of Training Program $x$ made a strong argument that their training program is superior to Training Program Y$,$ however, because the effects of Training Program X will last longer. It was concluded that Training Program $x$ is superior to Training Program $Y.$

Which of the following statements, if true, would most seriously weaken the above argument?

Training Program $Y$ is more fun than Training Program $x,$ according to those who took both.

The developers of Training Program $x$ are not well liked by their coworkers.

A vocal minority believe that people skills are not nearly as important as technical skills.

After six months, people who took Training Program $x$ had people skills similar to those who took Training Program $Y.$

After one year, people who took Training Program $Y$ had better people skills than people who took Training Program $x.$