Answer:
If the goal is to present a more objective argument, the best choice is option D: Delete "rather obvious" before "data" in sentence 11.
The term "rather obvious" could be seen as injecting a personal opinion or bias into the analysis. An objective argument should present facts, data, and perspectives without such editorializing language. Removing this phrase helps maintain a more neutral, objective tone throughout the passage.
The other options do not necessarily increase the objectivity of the argument. They mostly propose minor changes to wording that don't significantly alter the tone or balance of the presentation.