Which of the following is an example of extensive writing?

writing a poem that you do not share

writing a story that is personal and not for publication

writing notes in a private journal

writing an essay on a research topic

Since extensive writing is one that that is meant to be shared, you would pick an answer that you would be able to share and isnt personal. eliminate all three options except the one in which it isnt personal and you wouldnt mind it being shared. so writing an essay on a research topic is the answer.