Answer: (c) protecting the public from unsafe medicines and foods.
Explanation: FDA stands for Food and Drug Administration, which is a federal agency in United States. As completely resemble from the name itself, FDA is connected with food and drugs. It also helps in saving people from having unsafe food and medicines, and so the options (a), (b) and (d) will not serve our purpose. The correct answer is -It protects public from unsafe medicines and foods.
Thus, the correct option is (c).