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Which sentence is written correctly?
A. Monday, April, 20 2015 will be a great day!
B. Monday April, 20, 2015, will be a great day!
C. Monday, April 20, 2015, will be a great day!
D. Monday, April, 20, 2015, will be a great day!
C. Monday, April 20, 2015, will be a great day!