Read the following excerpt from a student essay. How can the writer best improve his or her grammar and mechanics?
Nearly out of breath, the door at the top of the stairs swings open, and I find myself on the main observation deck on the eighty-sixth floor of the Empire State Building. What a view there is! Looking down from this impressive landmark, New York City is displayed before me in every direction. To the southwest, the Statue of Liberty stands on Liberty Island in New York Harbor. This deck is one of the world's most famous movie sets, and it's also where my father proposed to my mother in 1995.

 - by fixing sentence fragments
 - by correcting misplaced modifiers
 - by fixing run-on sentences
The writer could best improve his or her grammar and mechanics by correcting misplaced modifiers.
For example, the writer could revise the text so that Nearly out of breath modifies I instead of the door and Looking down from this impressive landmark modifies I instead of New York City.
Nearly out of breath, the door at the top of the stairs swings open, and I find myself on the main observation deck on the eighty-sixth floor of the Empire State Building. What a view there is! Looking down from this impressive landmark, New York City is displayed before me in every direction. To the southwest, the Statue of Liberty stands on Liberty Island in New York Harbor. This deck is one of the world's most famous movie sets, and it's also where my father proposed to my mother in 1995.