问题详情

Thanksgiving Day, which originated in America, was first celebrated by the pilgrims after they had achieved a bumper harvest to show their gratitude to God and the Indians. Since 1863, it is celebrated on______.

A．November 31st

B．December 11th

C．the fourth Thursday of November

D．the fourth Thursday of December

请帮忙给出正确答案和分析，谢谢！