n its most basic form, structured on$-$the$-$job $($OTJ$)$ training involves having an experienced employee or trainer present job$-$related information to another employee one$-$on$-$one. However, OTJ training means more than just having Sally teach Mike how to do his job. OTJ trainers must have basic requirements in two areas. They must have adequate knowledge and skills in the task, and they must have adequate knowledge, skills, and attitudes as a trainer. Anyone can be effective as a trainer as long as they complete formal training for this role.

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

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Many trainers are already perceived by other employees as having special expertise, leadership abilities, or knowledge of the organization.

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Most people who work as trainers only last a few years in that role and then return to their regular jobs.

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A recent survey found that $40\%$ of trainers who received formal training in how to train others received less than satisfactory ratings in their post$-$training evaluations.

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It is not true that the best trainers are the ones who have been on the job the longest.

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Serving as a trainer can be a very rewarding experience because you get to see your coworkers grow in their skills and abilities.