Concept:An argument is strong when it is directly relevant to the issue and provides a logical, reasonable justification.
Explanation:Argument I states that terminating underperforming teachers will improve accountability and the quality of education.
This directly supports the proposal because accountability makes teachers more responsible.
So, Argument I is strong.
Argument II states that student performance is affected by many factors beyond a teacher’s control.
Therefore, using only student performance and feedback to judge a teacher may be unfair.
This gives a valid reason against the proposal.
So, Argument II is also strong.
Both arguments present relevant and reasonable points, even though they oppose each other.
Answer:Both Argument I and Argument II are strong.
Therefore, Option C is correct.