Although extremely liberal or very conservative candidates have been nominated for office, only candidates have been elected.

Moderate.

Explanation:

Political moderation is the political manifestation in which their representatives, regardless of the party they are, do not adhere to the most radical positions of their party, but remain within the central positions of the same, but in a position tending towards the consensus and dialogue with other political forces.

Thus, moderate politicians do not support the most extreme positions of their party, but, on the contrary, only support its fundamental values, abandoning the positions of conflict that can arise from the defense of more radical theories. An example of a moderate politician within the Democratic Party is Barack Obama, while an example of the same tenor within the Republican Party is Mitt Romney.

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.

what are the issues?