Which Compass is Pointing North? (中文)

解析

On a compass, the red tip of the needle always points North. In option A the red tip points toward the lower-left (south-west). In option B the red tip points straight up toward North. In option C the red tip points to the right (east). In option D the red tip points to the left (west). Only compass B has its red needle pointing directly upward, which is true North.