Which of the following describes a similarity between china's tang and song dynasties in the post-classical era
a) both relied on maritime trade instead of land-based routes
b)both isolated china from its neighbors to protect its culture
c) both grew wealthy through trade along the silk road
d) both fiercely persecuted religious and ethnic minorities

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.

your answer is: a passage or quotation taken or selected from a religious book example: the bible, torah, and the quran.

hope this !