The correct answer is: C. Either I or II is strong.
Argument I is strong because it is based on the evidence that participating in politics can help students develop leadership skills. This is supported by research that has shown that students who participate in student government or other extracurricular activities are more likely to become leaders later in life.
Argument II is weak because it is based on the assumption that students should not participate in politics until they have finished their studies. However, there is no evidence to support this assumption. In fact, many successful politicians have started their careers as students.
Therefore, either argument I or argument II could be considered strong.