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Verbal·Standard English Conventions·Boundaries

hard

In materials science, perovskite solar cells have gained considerable attention for their remarkable power-conversion        formed from synthetic organic-inorganic halide compounds, perovskite crystals can be processed from inexpensive chemical solutions at relatively low temperatures.

Which choice completes the text so that it conforms to the conventions of Standard English?

A

efficiency

B

efficiency,

C

efficiency;

D

efficiency, but