—We were not sure which way to go. In the end we chose to turn right.

—You _______ the wrong way. You _______ left.

A．had gone; must have turned

B．went; must have turned

C．had gone; should have turned

D．went; should have turned

一辆重15000牛轿车在平直的高速公路上匀速行驶1.8km，轿车上的速度表如图所示，在此过程中若轿车发动机的牵引力为450牛，则该车行驶中所受阻力是______N．