Final answer:
Behaviorism strongly opposed the use of introspection as a scientific tool, viewing it as subjective and unreliable for scientific inquiry.
Step-by-step explanation:
The school of thought that strongly opposes the use of introspection as a scientific tool is Behaviorism. Behaviorism, which was pioneered by John B. Watson, focuses on making psychology an objective science by concentrating on overt behavior and minimizing the importance of unobservable mental processes. Behaviorism is deterministic, as it views human behavior to be entirely determined by a mix of genetics and the environment, and it believes that introspection is not a reliable method of scientific inquiry due to its subjective nature.