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Who are the voice coaches?
A] Bruno Mars and Pharrelle Williams
B] Gwen Stefani , Usher, Snoop Dogg, and Adam Levine
C] Pharrelle Williams, Adam Levine, Christina Aguilera, and Blake Shelton
D] Gwen Stefani, Adam Levine, and Blake Shelton
C] Pharrelle Williams, Adam Levine, Christina Aguilera, and Blake Shelton