The theory of plate tectonics was, at first, rejected by most scientists. Now most geologists accept that tectonic plates exist and that these tectonic plates can and do move. What is responsible for the change in how scientists think about plate tectonics?
(A) New evidence was discovered that made scientists revise their ideas.
(B) Tectonic plates have begun to move faster and faster over time.
(C) There are more people studying science now than in the past.
(D)Scientists can now travel underneath the plates and observe their motion.