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.
Put a comma after yes, and remove the comma after Colorado.
Answer:
Your answer is C; "monitor comprehension of a text."
Explanation:
Got it right on edge