To my understanding proofreading is one of the following:
A. All writers should do
B. You don't need to do if you are a good writer
C. Only inexperienced writers need to do
D. You can only do for yourself
I feel that A is the correct answer. I feel that no matter how good you are , there is that chance that there might be a mistake made.

Please advise if this is correct and if not , please explain.