问题详情

Allie lives 3 km west of Billy"s house. Charlie lives 4 km north of Allie"s house and 3 km west of Danny"s house. What is the distance from Allie"s house to Danny"s house？
A．4 km
B．5 km
C．8 km
D．10 km
E．12 km请帮忙给出正确答案和分析，谢谢！