Final answer:
The efforts to reduce air pollution during the 1984 and 2008 Olympics were initially successful, but not sustained in the long term, aligning with option A.
Step-by-step explanation:
The efforts to curb air pollution during the 1984 and 2008 Summer Olympics were initially successful, but these improvements were not sustained after the events, making option A the correct answer. The phenomenon observed during these Olympic Games is analogous to the temporary improvements seen during events or interventions where specific short-term measures are taken. For instance, during the 2020 COVID-19 travel restrictions, there was a significant temporary reduction in emissions analogous to the Olympic air quality efforts. However, these temporary measures typically do not result in long-term sustained improvements unless followed by continued regulatory or infrastructural changes.