Read the following introductory paragraph:
Summer is here at last, and people are happily stepping out to enjoy the fresh air and sunshine. But there’s a cloud on the horizon. And another one in front of that doorway. And over there, hovering around an outdoor café. Clouds everywhere – clouds of cigarette smoke. Take a deep breath, and it’s not flowers you smell. Run barefoot through the park, but it isn’t just grass you’re stepping on. It’s cigarettes, and butts, and it’s time to put a stop to it. It’s time to ban smoking in all outdoor public spaces.
What is the main function of the sentence “It’s time to ban smoking in all outdoor public spaces,” in the paragraph?
It hooks the reader.
It introduces the topic / provides background information.
It presents the thesis.
It helps set the tone.