This combining form refers to a specific large artery
A) ather/o
B) arteri/o
C) aort/o
D) atri/o
C
Explanation: Aort/o means "aorta, or a very large artery." Ather/o means "fatty plaque"; arteri/o, "artery"; and atri/o refers to "atria, or the upper chambers of the heart."
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