The airplane had flown over the country.
Hope this helps!
B, as there is no point in a comma there. There is already an and in the sentence which is a conjunction.
The word order- how and where words are placed so that the reader gets an emotion (tone) based off of the placements of words from the reading
Punctuation- if there’s a lot exclamation points that would set a excited tone or surprised or a lot of periods could mean they want to be straight to the point
