The scientific community, initially ______ of the radical new theory, eventually had to ______ its stance as compelling empirical evidence began to ______ the unconventional claims.

✓ Correct Answer: Option A

Initial doubt suggests 'skeptical.' If evidence then supported the theory, the community would 'modify' its stance. The evidence would 'corroborate' (confirm) the claims. This sequence forms a logical and coherent narrative.