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.
