The maps above show the arrangements of earth's continents and oceans 65 million years ago and at present. which of the following best explains the change seen in the atlantic ocean over the last 65 million years? a. magnetic forces pushed continents toward each other to make the atlantic ocean basin smaller. b. tectonic plate motion caused the atlantic ocean basin to decrease in size. c. tectonic plate motion caused the atlantic ocean basin to increase in size. d. magnetic forces pulled continents apart to make the atlantic ocean basin larger.