By meeting the challenges of the prairie’s harsh climate and poor farming conditions, homesteaders eventually settled
a-50% of america’s urban areas, or more than 10 million acres.
b-50% of america’s west coast, or 35 million acres.
c-20% of america’s east coast, or more than 5 million acres.
d-10% of all american land, or more than 270 million acres.

d-10% of all American land, or more than 270 million acres.

Explanation:

The settlers were a society that had agriculture as the main source of family income. However, for promising agriculture, good climatic and soil conditions are needed, as well as quality agricultural tools. But what the settlers encountered were challenges of the severe prairie climate and precarious agricultural conditions, and for that reason, they settled in 10 percent of the entire American land, or more than 270 million acres.

the recent bombing of the uss cole is one of many incidents of terrorism directed against the united states. more than 40 percent of the world’s terrorism is directed against u.s. targets.   pursue the alleged perpetrators through the criminal justice system, and still others would beef up intelligence capabilities. to deal with potential attacks involving weapons of mass destruction, some analysts advocate extending the reach of law enforcement agencies or spending more on domestic preparedness programs; others would encourage a policy of u.s. military restraint overseas to attempt to reduce the motivation for terrorist attacks on u.s. targets.

c or d both can be the answer