Question

Each of the following sentences contains two blanks. Choose the most appropriate pair of words that best fits the context of the sentence. The options are deliberately close in meaning—read carefully before answering. Although the theory initially appeared ______, further scrutiny revealed it to be fundamentally ______, lacking both internal consistency and empirical support.

A plausible – untenable
B credible – verifiable
C persuasive – substantiated
D coherent – sustainable
E convincing – defensible
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