The author, G.K. Chesterton, mentions the development of "The Times" versus "bit bits" primarily to contrast serious writing with amateur writing. Therefore, the correct answer is A.
In the passage, Chesterton discusses the ease of writing serious articles compared to the difficulty of crafting jokes, emphasizing that serious writing is often the default choice because it's easier and more dignified. The comparison highlights his view on the challenges and responsibilities involved in producing serious literature versus lighter, more humorous content.