The correct answer should be locate basic information.
When you are doing the preliminary research, you are just reading through a bunch of sources and information that you may or may not use while writing. You still aren't deciding which exact sources you are actually going to use, but rather just trying to find them and later on make that decision during another stage of writing.
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>