What factors would encourage people to come to america over 100 years ago?

The factors are:

- Job opportunities
This happen due to the adoption of industrial evolution which require many workforce to help with the production

- Land availibiulity
The government announced that settlers from outside united states could come in an purchase land on a heavily discounted prices

- Huge amount of natural resources in our territory

I'm so sorry if I get you confused by I think it's B or D