In the Redox Reaction: BaSO₄ + 4 C $\rightarrow$ BaS + 4 CO, the Element Reduced Is ________

In the redox reaction: BaSO₄ + 4 C $\rightarrow$ BaS + 4 CO, the element reduced is ________.

A) S in BaSO₄
B) C
C) Ba in BaS
D) O in CO