Which theory is supported by scientists gathering the additional evidence of sea floor spreading and magnetism?

Answer: Harry Hammond Hess

Harry Hammond Hess was a geologist. He is one founding fathers of the unifying theory of plate tectonics. He discovered the flat-topped submarine volcanoes, which he termed guyots. His hypothesis on seafloor-spreading was supported by scientists because, the

ocean floor increased dramatically during his lifetime.

the theory of plate tectonics there is not " harry" in the question choice