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Verbal·Expression of Ideas·Transitions

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Vanadium is one of a variety of potentially useful trace elements contained in the chemical-rich brine that remains after seawater is purified through desalination. However, routine extraction of vanadium and other such elements from brine is not yet technologically or economically feasible.        most trace elements have only been extracted from seawater on an experimental basis.

Which choice completes the text with the most logical transition?

A

To date,

B

In doing so,

C

Finally,

D

Similarly,