The scientist's theory, while initially embraced for its elegance, proved ultimately _____ as subsequent experiments failed to _____ its central tenets.

✓ Correct Answer: Option B

The first blank requires a word suggesting the theory was weak or flimsy ('tenuous') because the experiments 'failed to' the second blank. 'Corroborate' means to confirm or support. If experiments failed to confirm it, the theory was indeed tenuous.