According to the passage, a mid-ocean ridge differs from a subduction zone in that

A. it marks the boundary line between neighboring plates : Wrong, not mentioned in the passage.
B. ​only the former is located on the ocean floor ​:
C. it is a site for the emergence of new lithospheric material ​: correct, as mentioned "At a mid-ocean ridge, new lithospheric material in the form of hot magma pushes up from the Earth’s interior. The injection of this new lithospheric material from below causes the phenomenon known as sea-floor spreading."
D. the former periodically disrupts the earth’s geomagnetic field ​: Wrong, out of context.
E. it is involved with lithospheric destruction rather than lithospheric creation : Wrong, it is opposite.



It can be inferred from the passage that as new lithospheric material is injected from below ​

A. the plates become immobilized in a kind of gridlock ​: Wrong, out of context.
B. it is incorporated into an underwater mountain ridge ​: Correct. As mentioned " a long chain of sub-oceanic mountains "
C. the earth’s total mass is altered ​: Wrong, the question was raised but answered later in passage. "an equal amount of lithospheric material must be destroyed somewhere else. This destruction takes place at a boundary between plates called a subduction zone."
D. it reverses its magnetic polarity : Wrong, out of context.
E: the immediately adjacent plates sink : Wrong, out of context. in subduction zonne it may happen but not adjacent.