The first sentence is not properly punctuated. The third and the fourth sentences as well. The only sentence with the correct punctuation is the second sentence. A semicolon is used to join two complete sentences with related ideas. The second sentence is actually made up of two related sentences joined by the semicolon.
Piece of cake. First person. You can tell by the way the narrator says "I".
Present or past time. Normally present and language like a person in that time or a reporter. :)
Answer:
C. Experienced, experienced means you know what your doing and have a history of "this job"
Explanation: