The correct answer is: Neither I nor II follows.
The statement only tells us that the majority of students in many schools do not pass in the final examination. It does not tell us why this is the case. It is possible that the schools are indeed unproductive, but it is also possible that there are other factors at play, such as students not being prepared for the exam, or the exam being too difficult. Without knowing more information, it is impossible to say whether or not closing down the schools or retrenching the teachers would be the best course of action.
Option I: These schools should be closed down as these have become unproductive.
This option is not necessarily the best course of action, as it does not address the root cause of the problem. If the schools are indeed unproductive, it is possible that there are other factors at play, such as students not being prepared for the exam, or the exam being too difficult. Closing down the schools would not solve these problems.
Option II: The teachers of these schools should immediately be retrenched.
This option is also not necessarily the best course of action, as it does not address the root cause of the problem. If the teachers are not effective, it is possible that they are not being given the resources they need to do their job, or that they are not being properly trained. Retrenching the teachers would not solve these problems.
In conclusion, neither option I nor option II is necessarily the best course of action. More information is needed to determine the best course of action.