Which sentence contains a misplaced modifier?

a.
mr. swanson folded up the tent and packed it away in a sack.

b.
the swansons pulled on their backpacks and walked to the trailhead.

c.
the boys chattered about their fishing trip inside their tent.

d.
after much anticipation, the swansons began their five-mile hike up the mountain.

ich statement best shows a problem in travels with charley?

one sharp difficulty presented itself. in the intervening twenty-five years my name had become reasonably well known.

this being so, my trip demanded that i leave my name and my identity at home.

i had to go alone and i had to be self-contained, a kind of casual turtle carrying his house on his back.

with all this in mind i wrote to the head office of a great corporation which manufactures trucks.

i cannot see any of the options