The best pre-writing technique that will help you to generate ideas is freewriting (OPTION B). Through this technique, the writer simply writes continuously about whatever comes to his/her mind, they let their mind to go where it wants to. In here, grammar rules and structure are not important. Freewriting helps to overcome the writer's block, collect initial thoughts and ideas on a topic, that will later become more organized and polished in the final writing, of course, it is common that all ideas drafted here will not be in the final writing as well.