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?

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

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

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

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

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