Which innovation from the song dynasty had the greatest impact on the expansion of global empires?
a. accurate star charts
b. horse stirrups
c. better navigation tools
d. chemistry for explosives.

i think it could be c

The answer is "D. Chemistry for explosives".

Artisans and scholars made essential innovative advances amid the Tang and Song dynasty. Among the most imperative developments were movable type and gunpowder. With movable type, a printer could mastermind squares of individual characters in an edge to make up a page for printing. Beforehand, printers had cut the expressions of an entire page into one substantial square. The development

of gunpowder, in time, prompted the production of explosive weapons, for example, bombs, projectiles, little rockets, and guns.  

Other imperative innovations of this period incorporate porcelain, the mechanical clock, paper cash, and the utilization of the attractive compass for cruising.

churchill warned that the soviet union had cut eastern europe off from the west with an "iron curtain."

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president franklin roosevelt supported the tva as part of his first new deal measures approved by congress in 1933. this new agency was designed to control floods, produce electric power, and improve the lives of people living in the tennessee valley. the tva accomplished many of these goals despite problems.