Question

1. in the late 1800s, new farming technologies caused people to see the great plains as a —

worthless dust bowl
vast area to be settled
prime area for mining
important industrial center

Explanation:

In the late 1800s, new farming technologies made the Great Plains more suitable for agriculture, leading people to view it as a place to settle. "Worthless dust bowl" is incorrect (the Dust Bowl was later). "Prime area for mining" and "important industrial center" don't fit as the Plains were agricultural. So the correct choice is the option about a vast area to be settled.

Answer:

The option "vast area to be settled" (the third option in the list, with the radio button)