Which sentence has a correctly placed participial phrase?
a. lasting over four hours, my friends threw a party at an amusement park.
b. my friends lasting over four hours threw a party at an amusement park.
c. my friends threw a party lasting over four hours at an amusement park.
d. my friends threw a party at an amusement park lasting over four hours.

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.