I believe it's B. Carefree days of a happy childhood
I do not get what question you are trying to ask sorry.
Writing process stage which involves looking through the written draft for problems with minor details like punctuation and capitalization is D. Proofreading.
Proofreading is that stage of writing wherein, after editing the proofreading is done in order to blemish the minor details (before the final print) that may have escaped our attention like punctuation and capitalization.
