Must slow down + avoid or stop on the right side of the road.
Answer 1 is incorrect because avoid or stop close to the left side of the road, answer 2 is incorrect because increase speed.
Must slow down quickly, avoid or stop on the left side of the road to give way.
Must speed up quickly, avoid the edge of the road to give way to priority vehicles; prohibit acts of obstructing priority vehicles.
Must slow down quickly, avoid or stop close to the right side of the road to give way; must not obstruct the right-of-way vehicle.