According to the news item, what is expected from Obamas announcement？A．A gradual withdraw

According to the news item, what is expected from Obamas announcement？

A．A gradual withdrawal of American troops from Afghanistan.

B．A rapid withdrawal of around 5,000 troops from Afghanistan.

C．A decision of Democratic Party on American troops in Afghanistan.

D．An agreement between Republicans and Democrats on troops in Afghanistan.

请帮忙给出正确答案和分析，谢谢！