Read Carefully Through the Paragraph Below, and Decide Which of the Options

Multiple Choice

Read carefully through the paragraph below, and decide which of the options is correct. The principle of isostasy explains variations in surface elevations in terms of the type and thickness of underlying crust. Low-density crust floats on denser, underlying mantle so that the temperature is everywhere the same at the base of any thick vertical column through the crust and upper mantle.

A) The word " isostasy" should be replaced by "superposition."
B) The word " elevations " should be replaced by "pressures."
C) The word "temperature" should be replaced by " pressure ."
D) The words " underlying crust " should be replaced by " underlying mantle."