The correct answer is: C. Either I or II is implicit.
The statement “Please put more people on the job to make up for the delay” implies that the current number of people on the job is not enough to complete the task on time. This could be because the task is more complex than expected, or because there have been unexpected delays. In either case, adding more people to the job will increase the total output, which will help to make up for the delay.
However, the statement does not explicitly state that delay is inevitable in most jobs, or that output will increase with more number of people on the job. These are simply possible explanations for why the current number of people on the job is not enough. It is also possible that there is another reason why more people are needed, such as a lack of coordination or communication between the current team members.
Therefore, the correct answer is that either assumption I or assumption II is implicit.