The correct answer is: Only I and III are strong.
Argument I is strong because it is based on the consideration of the needs of the students. It is important to ensure that all students have access to quality education, and debarring school teachers from giving private tuitions could deprive some students of this opportunity.
Argument II is weak because it is based on the consideration of the interests of a particular group of people, namely unemployed educated people. While it is important to consider the needs of all members of society, this argument does not take into account the needs of the students.
Argument III is strong because it is based on the consideration of the quality of education. If school teachers are debarred from giving private tuitions, they will have more time to focus on their teaching in schools. This could lead to an improvement in the quality of education.
Argument IV is weak because it is based on the consideration of the salary of school teachers. While it is important to ensure that school teachers are paid a fair salary, this argument does not take into account the needs of the students.
In conclusion, only arguments I and III are strong.