The CORRECT answer would be, "Maria saw an emergency vehicle racing down the street with sirens blaring."
I took the test btw
1. At the NS picnic everyone brings a dish that might be unusual.
2. Mrs. Taylor.
3. I'll try something only if I know what it is.
4. She actually did like it , she asks Mrs. Taylor for the recipe.
5. Things that she knows what they are.
6. Her dad.
7. Yes but not anything overly unusual.
I believe that the answer is the third option.
The answer should be an object of a verb. The bold words are neither a proposition(which is a word that expresses a relation to another word, like "after" or "next to") or the subject. The subject in this case would be the city of Washington.
