The correct answer is: A. Only argument I is strong
Argument I is a strong argument because it provides a reason why the council of ministers should not be kept the same for the entire period intervening two elections. The argument states that shuffling of ministers and portfolios is a healthy democratic process. This is because it allows for new ideas and perspectives to be brought into the government, and it also prevents any one minister from becoming too powerful.
Argument II is a weak argument because it does not provide a reason why the council of ministers should be kept the same for the entire period intervening two elections. The argument states that the ministers do not get a hold on their portfolio unless they are kept for a longer duration. However, this does not mean that the ministers will be more effective if they are kept for a longer duration. In fact, it is possible that the ministers will become complacent and less effective if they are not regularly challenged.
In conclusion, only argument I is a strong argument.