When they see something that look familiar, or smell something like food, and when they see some familiar face.
Like if you are in the park playing soccer, and you see some familiar dog that belong to you long time ago.
The answer is C. The idiom best describes the process of finding small-scale ways to bring about large-scale changes. In other words, people should help in caring for the world by doing the best things to improve the environment within the proximity. The phrase "Think Globally, Act Locally" was first coined by René Dubos when he spearheaded the group of scientists in the <span>United Nations Conference on the Human Environment. </span>