Last weekend, the local community _____ a clean-up event to improve the environment.

a. First, they wanted stricter traffic laws to stop drivers from ignoring traffic lights and breaking speed limits. This would help reduce road accidents.

b. The carried out a survey with city dwellers about how to make the city a more livable local newspaper place. Most participants in the survey talked about the city's traffic.

c. Finally, they suggested the local authority build traffic apps. The apps could recommend to drivers the best routes to avoid traffic accidents.

d. In addition, they hoped their city would improve its public transport system. Buses should be clean and have air conditioners. There should be bus lines that reach almost all areas in the city, so it would be easy for people to get around.