[单项选择]　　Scattered around the globe are more than 100 small regions of isolated volcanic activity known to geologists as hot spots. Unlike most of the world’s volcanoes, they are not always found at the boundaries of the great drifting plates that make up the earth’s surface; on the contrary, many of them lie deep in the interior of a plate. Most of the hot spots move only slowly, and in some cases the movement of the plates past them has left trails of dead volcanoes. The hot spots and their volcanic trails are milestones that mark the passage of the plates. 　　That the plates are moving is now beyond dispute. Africa and South America, for example, are moving away from each other as new material is injected into the seafloor between them. The complementary coastlines and certain geological features that seem to span the ocean are reminders of where the two continents were once joined. The relative motion of the plates carrying these continents has been constructed in detail, but the motion o
A. the motion of the plates corresponds to that of the earth’’s interior
B. the geological theory about drifting plates has been proved to be true
C. the hot spots and the plates move slowly in opposite directions
D. the movement of hot spots proves the continents are moving apart

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