Which are important technological innovations of the Song Empire?

a. The stern-mounted rudder, high-quality steel, and gunpowder
b. Silk, the saddle, and the printing press
c. The battering ram, the chariot, and the lateen sail
d. The astrolabe, the horse collar, and the crossbow
e. The clock, paper, and the cure for the plague


ANSWER:
a

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