The correct answer is:Level of risk for acquiring new skills
Rationale: Off-the-job training allows people to make mistakes in learning, without the costs and consequences of making the same mistakes on the job. However, formal courses may not always be directly relevant to the circumstances of the job and workplace (relevance of learning to the job), and it may not be easy to 'transfer learning' from the classroom to the job, for various reasons (application of learning to the job). Meanwhile, formal courses take people away from work (continuity of work effort). You could think of these options as advantages of on-the-job training.
Pitfalls: Make sure you get 'off-the-job' and 'on the job' the right way round as you read the question - and as you think through the options.