**Core Concept**: Vocabulary (word usage). **Analysis**: - 'Compromise' means 'to settle by mutual concession' or 'to weaken'. Only option A uses it correctly (refusing to weaken principles). - Option B misuses it as 'complete', C confuses it with 'comprise', and D implies 'improved' (contradicting the negative connotation). **Key Point**: 'Compromise' implies concession or reduction in quality. **Error Alert**: Confusing 'compromise' with phonetically similar words like 'comprise'.