Answer:
The Concrete Operational Manner classroom is gonna have difficulty.
Explanation:
This is the answer because Concrete Operational Manner is related to the appropriate use of logic, but it doesn't involved abstracts thinking, logical thoughts and deductive reasoning, this stage of thinking doesn't involved these three elements at once.
So to understand the concept of molecules you need to abstract its definition to understand it, because you can't see a molecules directly in your hand, and then through logical and deductive reasoning, developed the concept for yourself.