FALSE because "Sit!" is a sentence as when you instruct a dog to sit that is a whole sentence on its own.
The answer is C. if the underlined word is "get"
It is a simple sentence because it has one subject and one predicate.
The only line among these which is written in iambic pentameter is A) "I lift my lamp beside the golden door."
This line has 10 syllables, which means it has 5 meters (to count the number of meters, you first count the number of syllables and then divide that number by 2). Since it has 5 meters, and the Greek word for 5 is penta, it must be an iambic pentameter.