As fur trading declined in the Oregon Country, John McLoughlin encouraged people to a..move to Alaska.
b..learn to fish.
c...settle in the region.
d...respect the environment

president thomas jefferson commissioned the expedition shortly after the louisiana purchase in 1803 to explore and to map the newly acquired territory, to find a practical route across the western half of the continent, and to establish an american presence in this territory before britain and other european powers

a.   it resulted in widespread unemployment.

so what is your question?

offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering