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Read the following passage below and answer the question that follows: Scattered...


Read the following passage below and answer the question that follows:
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 boundaries of the great drifting plates that make up the earth's surface; on the contrary, many of them lie in the interior of a plate. Most of the hot spots nove only slowly, and in some cases the movement of the plates past them has left trails of extinct 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 receding from each other as new material is injected into the sea floor between them. The complementary coastlines and certain geological features that seem to span the ocean are reminders of where the two continents were joined. The relative motion of the plates carrying these continents has been constructed in detail, but the motion of one plate with respect to another cannot readily be translated into motion with respect to the earth's interior. It is not possible to determine whether both continents are moving or whether one continent is stationary and the other is drifting away from it. Hot spots anchored in the deeper layers of the earth, provide the measuring instruments needed to resolve the question. From an analysis of the hot spot population, it appears that the African plate has been stationary during the past 30 million years. The significance of hot spots is not confined to their role as a frame of reference. It appears they have an important influence on the geophysical processes that propel the plates across the globe. When a continental plate comes to rest over a hot spot, the material welling up from deeper layers creates a broad dome. As the dome grows, it develops deep fissures; in at least a few cases the continent may rupture entirely along some of these fissures, so that the hot spot initiates the formation of a new ocean. Thus just as earlier theories have explained the mobility of the continents, so hot spots may explain their mutability.
Which of the following statements indicate that Africa and South America once adjoined one another.
(I) They share certain common topographical traits
(II) Their shorelines are physical counterparts
(III) The African plate has been stable for 30 million years


I only
II only
II and III only
I and II only

The correct answer is C.

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