This ones correct
<span>B.The students' completed projects were displayed for parents at the open house.
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You won't believe it there was a alligator in my room blocking the way out. it just appeared out no nowhere. Suddenly I heard a noise when I walked in my room. It was a scary noise. I couldn't belive it. There was an alligator in my room.
A votive ship, sometimes called a church ship, is a ship model displayed in a church. As a rule, votive ships are constructed and given as gifts to the church by seamen and ship builders.
No, this is a complex sentence because it contains an independent and a dependent clause.