Barium 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 barium 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.
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Verbal·Expression of Ideas·Transitions
mediumWhich choice completes the text with the most logical transition?
A
Finally,
B
Similarly,
C
In doing so,
D
To date,