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Verbal·Craft and Structure·Words in Context
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Solar physicists studying the Sun have identified an important        between magnetically active and relatively quiet regions. In active regions, bursts of ultraviolet light usually come before substantial decreases in magnetic energy, whereas in quiet regions, ultraviolet light intensity and magnetic energy remain continuously correlated without notable energy drops.
Which choice completes the text with the most logical and precise word or phrase?
A
interaction
B
disparity
C
trade-off
D
analogy