They would travel on foot
Answer:
c. civil service examinations
Explanation:
In order to fill government positions, the Tang, Song, and Ming dynasties all used CIVIL SERVICE EXAMINATIONS.
In ancient China, imperial examinations were used to select government officials using written examinations and this use of meritocracy was influenced during the Tang Dynasty.
The Tan, Ming and Song Dynasties all used examinations to test the knowledge of candidates on subjects like Chinese classics, poetry and administrative issues.
Roots rock emerged in the mid to late 1960s as a combination of several genres and subgenres of rock music that were popular at the time.
Due to the fact that there were hot air balloons and everything else, he wanted to explore beyond that and go to the next level, which then in turn made him want to start tinkering with rockets.