Pioneers began their Oregon Trail journey at jumping-off towns most likely to a..buy land in the west.
b..join large groups traveling west.
c...prepare for traveling in winter.
d..join a missionary group.

B.) join large groups traveling west.

Explanation:

or "Pioneers joined large groups in "jumping off" towns such as Independence, Missouri." Hope this helped!!

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d.prevent the spread of communism outside of eastern europe.