Correct Answer - Option 4 : Either I or II implicit
Given Statement: A leading school in Dehradun has increased its fees by 150% from the next academic year.
I. Students may change school due to more fees → It is possible but not definite.
II. The school may still have the same demand among the student → It is possible but not definite.
If the school is increasing the fee by 150%, then the students may or may not change the school.
Hence, Either I or II can be assumed from the given statements.