Teachers are effective only when they help their students become independent learners.
Statements
The correct answer to Must Be False most frequently contradicts some conditional relationship. We can see that there are multiple conditionals here from words such as "only when" / "not until" / "essential".
All of these are synonyms for "requirements", and the Required thing always goes on the Right side.
Effective → help students → students → teachers teaching become ind. can make have learners own power to decisions make decisions
The final sentence just summarizes the Start / End of this chain, so it's not a new thought we need to do anything with.
Goal
The question stem is asking,
Effective → help students → students → teachers teaching become ind. can make have learners own power to decisions make decisions
According to this chain, we only know one thing: these teachers have the power to make decisions in their own classrooms.
They may or may not be effective teachers. They may or may not help their students become independent learners.
But they definitely have the power to make decisions in their own classrooms.
So we should be looking for a correct Must Be False answer that says .