The main way dramatic tension is built is the clues that Boo gives, making him interesting, but it can also be frightening.
Also, the incidents that pop up in the story also builds up dramatic tension.
The correct answer is A. All flags were flying.
Explanation
A complete phrase is composed of a subject, a verb, and a compliment that also expresses a completely coherent idea. According to this definition, the correct answer is A. because it has a subject "All flags", a verb "were" and a complement "flying". Also, it expresses a complete and coherent idea.
An amount/number of something
Quantitative describes the quantity of something
Qualitative describes the quality of something
