The economics news on the television reports that the dollar has strengthened relative to

The economics news on the television reports that the dollar has strengthened relative to the Japanese yen. This means that______.

A．the dollar has depreciated relative to the yen

B．the US trade balance with the Japanese economy has improved

C．the yen can now purchase more dollars

D．the dollar can now purchase more yen

请帮忙给出正确答案和分析，谢谢！