What kept most foreign invaders from China's lands? fearsome samurai
natural barriers such as seas, mountains, and deserts
soldiers placed along the Silk Road
Mongol warriors hired by China's emperors

answer: refers to a diverse array of media technologies that reach a large audience via mass communication. the technologies through which this communication takes place include a variety of outlets. your welcome i hope you me out in the future : (

explanation:

the structure was most likely used for;

c. playing a ball game with stone hoops

d is the right answer

not all were fit for battle and were weak.