Explain why is it important to know the purpose and audience before you choose your topic and why is it important to know your main ideas before you begin writing

you need to know the purpose and audience before you choose your topic so you can choose a topic that will fulfill the purpose and that your audience will be interested in. you need to know your main ideas before you begin writing so you have a direction and you know where you're going with your writing. otherwise your work won't be cohesive.

lemme actually be useful and say i believe the answer is the first one.

that amenable is willing to respond to persuasion or suggestions while docile is yielding to control or supervision, direction, or management.