【单选题】

Questions 9 and 10 are based on the following news.At the end of the news item, you will be given 20 seconds to answer the questions.

Now listen to the news.
The trade dispute between theEuropean Union and the US was caused by ______.A．US refusal to accept arbitration by WTO
B．US imposing tariffs onEuropean steel
C．US refusal to pay compensation toEU
D．US refusal to lower import duties onEU products