The answers
2) The writer accepts and implements constructive feedback about the paper.
All good writers should accept and implement constructive feedback as this is how they learn to become better writers.
4) The writer practices writing several drafts of the paper.
All good writers should make several drafts of their paper before composing the final copy. This allows them to work out any problems or make any changes before finalizing their work.
6) The writer makes sure there are no grammatical errors in the paper.
Any good piece of writing should be 100% free of any grammatical errors, this is very important.
All other options are bad writing practices and should not be implemented at all.