Which excerpt from the letter to the editor includes an opinion?
a. our city currently has a dense downtown area and then a massive amount of sprawl reaching out in every direction- the sprawl takes up seventy- five percent of the city's land.
b. we need to ask for a change at this critical juncture, as our city rapidly expands at an unprecedented rate.
c. the residents who live in these faraway suburbs often work downtown, where the majority of businesses are still located.
d. besides the business district, the city university, our two museums, and the most popular places to shop- including four grocery stores- are all in the center of the city, to name just a few key places.