Answer: c. an idea
Explanation:
St Jude's is a Not-for-profit children's research hospital that aims to help children as much they can. They specialise in trying to treat childhood cancer and other terminal illnesses.
When they advertise their goal which is to find cures and thus save children, they are advertising the idea behind their organization so that people can understand what they are about and reach out to them to either support or receive their services.
