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Verbal·Expression of Ideas·Transitions
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Standard silicon solar cells are physically constrained by the Shockley-Queisser limit, which caps the maximum theoretical energy conversion efficiency of a single p-n junction at approximately 33%.        to bypass this thermodynamic constraint, photovoltaic engineers are fabricating tandem multi-junction cells that stack semiconductor layers with different bandgaps to absorb a broader spectrum of solar radiation.
Which choice completes the text with the most logical transition?
A
Specifically,
B
In contrast,
C
Thus,
D
Nonetheless,