I would have to say A woulod be the best choice.
Answer:
1.To meet, especially unexpectedly; come upon: encountered an old friend on the street.
2.To confront in battle or competition: encountered last year's champion.
3.To experience or undergo: We have encountered numerous obstacles.
Answer: B. What level of interest do my readers likely have in my topic.
Explanation: When you plan to write a procedural document, you must address your audience by asking yourself what type of writing style the readers best respond to. It is essential to get the reader's attention so a standard format of a document and use of simple words must be determine to convey the purpose of a procedural document.
The correct answer would be B, since complex sentences have 1 independent variable and one dependent variable.
The dependent variable would be: Everytime he hears a siren
Why? Because it is not a complete thought.
The independent variable would be: My dog howls loudly.
Why? This statement is a complete thought.
A would be a compound sentence
C would be a simple sentence
D would be compound complex.
Hope I could help!