Must combine both conditions of 30m advance signal and speed reduction.
Answer 1 is wrong because of lack of warning 30m, answer 3 is wrong because of speed up.
There is a right turn signal; look behind for safety; control the vehicle to the left lane; slow down and watch safely on the right side to control the vehicle through the intersection.
About 30m from the turn, there is a right turn signal; watch for safety behind ; control the car to stick to the right side of the road; slow down and watch safely on the right side to control the vehicle through intersection.
About 30m from the turn, there is a right turn signal; watch for safety behind ; control the car to stick to the right side of the road; increase speed and watch safely on the left side to control the vehicle through intersection.