Which of the following would best explain why a species of wildflower native to Switzerland is observed growing in the wild in Montana?

After a thorough research, there exists the same question that has the following choices.

1) Wind dispersed seeds of the wildflower.

2) Water dispersed seeds of the wildflower.

3) An animal ate seeds and later dispersed them.

4) A human brought and dispersed the seeds.

The correct answer is choice number (2) Water dispersed seeds of the wildflower.