Answer:
have developed a health-conscious attitude
Step-by-step explanation:
A lot of people are starting to realize that they need to take care of themselves and their health. By biking to work Dennis and Donna will exercise regularly which is very good for them, and eating vegetables is always a plus for your health.
Although some websites emphasize that the country is continuously under the threat of terrorist attacks, you have a greater chance of being hit by a lighting than being killed by a terrorist in US soil.
If Dennis and Donna disliked urban centers then they wouldn't be working on a hospital located at an urban center. They would be living in Alaska and filming their own survival stories for History Channel.