Answer:
A). Falsifiability.
Step-by-step explanation:
As per the question, the 'falsifiability' principal of critical thinking has been reflected here as it shows the falsifiable aspect of a statement/proposition in case a specific observation displays it to be false. Therefore, the criticism of the proposition of levels-of-processing model by Craik and Lockhart mirrors the 'falsifiable aspect' of the hypothesis(through the observation) which leads to the conclusion that 'there is no way to truly and scientifically prove or disprove the theory'. Therefore, option A is the correct answer.