There is a lot of traffic in the street,---------- look both

There is a lot of traffic in the street,---------- look both ways before crossing it.
A.so B.or C.but D.because
选A
根据逻辑关系选择连词
全句翻译为
街道上交通很拥挤,【所以】你要在过马路之前看看两边
B表示选择
C表示转折
D表示因果
A表示所以的因果
所以选A