I say its...
Traveling toward the west, the caravan made slow but steady progress.
Hope it helped :)
The answer is a to reinforce the meaning of the content
The conclusion of a narrative is to kind of summarise a narrative and some times to show a counter claim
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Explanation:
Thomas Edison created many inventions, but his favorite was the phonograph. While working on improvements to the telegraph and the telephone, Edison figured out a way to record sound on tinfoil-coated cylinders. In 1877, he created a machine with two needles: one for recording and one for playback.
