—The problem isn't difficult for the children to work out, is it？

—_____ . Perhaps they should have been given a more difficult one. 

A．Yes, it is

B．Yes, it isn't

C．No, it is

D．No, it isn't

机动车仪表板上（如图所示）亮时表示什么？（）

A．已开启前照灯近光

B．已开启前雾灯

C．已开启前照灯远光

D．已开启后雾灯