Question

Once you acquire these two basic skills, you'll be able to transform a vague idea in your mind into a coherent piece of writing.

a. Doing interviews and browsing through books
b. Describing people and writing conversation
c. Doing research and organizing your ideas
d. Using the Internet and the on-line catalog

Answer 1

I would say that the best answer here is c. Doing research and organizing your ideas. Doing research will ensure that your idea makes sense in a wider context (other knowledge, other people's ideas), and organizing your ideas will ensure that your writing is coherent.