Answer:
I would say then is the answer.
Explanation:
The other words don't make sense and don't sound right.
Answer:
At the Naval Surface Warfare Center outside of Washington D.C, a sophisticated indoor ocean that can recreate eight different open-water conditions is used to test models of ships.
Explanation:
The subject-verb agreement, simply said, represents the grammar rule where subject and verb must agree in number, so if the subject is singular, the verb must also be in singular and vice versa - if the subject is plural, then the verb must be plural too.
In the given sentence we have the subject: <em>a sophisticated indoor ocean - </em>which is singular and we have the verb: <em>are</em> - which is plural, so they do not agree in number, so we have to change the number of the verb in order to have the subject-verb agreement completed.
You have interesting topic. You look at the person straight in the eyes. Don't stammer and break up your words. Make it easy for the other person to understand your statement.
What orders do they have to follow?, what do they have to do?:)