In Rome slaves were trained to be what?

In Rome, captured, fit, male slaves from other "barbarian" armies, were typically sent to gladiator school, and then to the Arena to fight each other. They were commonly known as gladiators, and fought for the public's entertainment, as well as for their own freedom, if they were to survive long enough to be able to do so.

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i think the answer is c, rivers.

explanation:

sometimes, borders fall along natural boundaries like rivers or mountain ranges. for example, the boundary between france and spain follows the crest of the pyrenees mountains. for part of its length, the boundary between the united states and mexico follows a river called the rio grande. the borders of four countries divide africa’s lake chad: niger, chad, cameroon, and nigeria.

the answer is b.

hope this !