The hot spot theory may prove useful in explaining ______.

A．the features of volcanic activities
B．the importance of the theory about drifting plates
C．the significance of hot spots in geophysical studies
D．the process of the formation of volcanoes

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