Which one of the following sentences uses the comma or commas correctly?Najib breathed a long heavy sigh.

1one sharp difficulty presented itself. in the intervening twenty-five years my name had become reasonably well known.2 this being so, my trip demanded that i leave my name and my identity at home.3 i had to go alone and i had to be self-contained, a kind of casual turtle carrying his house on his back.4 with all this in mind i wrote to the head office of a great corporation which manufactures trucks.

She either must have not been on the phone and working or something else. it seems that here boss catches her a lot of the time on the phone and not doing work but hasn't been fired yet.