The sentence presents both praise and criticism for the city’s new public transportation system:
- The first clause praises the system for its efficiency and reduction in pollution. This calls for a positive verb like “lauded” (Option (A), which means praised or highly approved.
- The second clause introduces contrast using “but”, highlighting a negative aspect: increased fares burdening low-income residents. This clearly requires a critical verb, and “criticized” (Option (B) fits best.
Let’s evaluate other Option:
- Option C (implemente(D) is not about praise or criticism; it simply refers to putting something into action.
- Option D (celebrate(D) and Option F (praise(D) are synonyms of “lauded,” but only one of these should be selected — and “lauded” ((A) is the better formal fit.
- Option E (challenge(D) doesn’t clearly capture criticism; it suggests opposition but is less direct and not as appropriate in this context.
Correct Pair:
- (A) lauded — praised for efficiency and environmental benefits
- (B) criticized — for fare increases impacting low-income groups