The correct answer is: A) Provides more information about a topic.
When you want to write about a topic it is necessary to have previous knowledge about it; in this way you will have a deeper undestanding of it. Making research can also help you to find the things that you were not sure or that were incorrect and describe them in a precise way, giving accurate information and solid arguments. But you won't only find that your knowledge can grow bigger, you will be able to trace the different opinions and facts about the topic taking a side or increasing the information. In a few words, you will be able to write a more interesting text , providing the newest information and giving solid arguments.