Answer:
For the first time in history, more people live in cities than rural areas. Every year millions of people leave their homes in the countryside and migrate towards urban centres both within their own countries and across borders. Some of these people move simply to seek new opportunities and improve their lives.
It's d because all others have a conjuncyion
The nurse seemed like she waited only because she was tired and out of breath, but she kept talking and acted as if she was stalling.
Answer:
the first sentence is a run on because there is no punctuation
