According to the passage, which of the following is CORRECT？A．Abraham Lincoln declared the

According to the passage, which of the following is CORRECT？

A．Abraham Lincoln declared the first Thanksgiving feast.

B．A poet started the campaign to celebrate Thanksgiving Day.

C．George Washington used Thanksgiving Day to unite the USA.

D．Abraham Lincoln announced Thanksgiving a national holiday.

请帮忙给出正确答案和分析，谢谢！