Answer:
The correct option is 2. At least 3 schools have participated for 6 years or more.
Explanation:
From the given information it is clear that the first quarterly of the data is 2 and the third quarterly is 6.
The box plot is shown below.
Since 6 is third quarterly it means 6 divides the data in 75% and 25%.
So, 25% schools have participated for 6 years or more.
Number of terms =12

Therefore, at least 3 schools have participated for 6 years or more. Option 2 is correct.