甲袋中有3个白球2个黑球，乙袋中有4个白球4个黑球，现从甲袋中任取2球放入乙袋，再从乙袋中取一个球放入甲袋。已知从乙袋取出的是白球，问从甲袋取出的球是一黑一白的概率为多少？（　　）

A、<img width="13" height="37" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-19/c21d1538-b509-4d0b-bff0-db05805f32aa.png" />

B、<img width="19" height="36" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-19/7e599583-d823-4e27-ba8c-eadeca60e59e.png" />

C、<img width="19" height="36" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-19/f42b5ef8-7db9-40b1-9044-0fb67ad39fba.png" />

D、<img width="13" height="36" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-19/15c86cdf-6b35-4220-96eb-7b5e8a3a487a.png" />