What is a contemporary empire that you could choose to compare to a historical empire ?

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.

i dont know the answer sorry but if i knew it i would of told you

(b) britain had a much larger navy than the u.s.

(d) the u.s. had a small army compared to britain.