Please choose the correct answer to the question: How is the theory of plate tectonics different from a hypothesis regarding a certain aspect of plate movement?

Answer1: The theory addresses an Earth-science topic. Answer2: The theory may change if new evidence emerges. Answer3: The theory explains a number of related observations. Answer4: The theory can be evaluated by a single-variable experiment.

Answer format: answer1/answer2/answer3/answer4
Answer: answer3