We need more information.
1. He approaches a clearing in the woods, Bilbo sees three huge trolls sitting around a fire, eating mutton
2. The trolls threw sacks over each dwarf that approached.
3. Gandalf saved them by throwing his voice to mislead the dwarves and keep the trolls arguing until the morning.
4. They found weapons and took them.
I would say A. Chronological order and vivid images. because that makes the most sense.
This statement is a fact. I know from personal experience. I observed when a gallon water jug was placed outside on a night reaching below freezing temperatures. The next morning after my dad went outside to grab the water jug, he found that there was a bulge on the side of the jug. This goes to show that when frozen, water expands, explaining as to why there was a bulge on the side of the gallon and all the water inside the jug had frozen and turned to ice.
