Read this sentence: when the scientists drilled into the ground, they found a system of subterranean rivers. based on the context, subterranean means which of the following?

Well, subterranean means below Earths surface so they found rivers underground.

Not b or c so that leaves you with a or d. a is the better choice.

Atahualpaemperor of the inca empire who rose to the throne after winning a civil war between him and his brother.  -he refused to become a spanish vassal or christian.-francisco pizarro kidnapped him and demanded a huge ransom.  -pizarro's secretary described him as "a man of thirty years, good-looking and poised, somewhat stout, with a wide, handsome, and ferocious face, and the eyes flaming with blood."-after the ransom was paid, atahualpa was killed by pizarro