Correct!

What should you do before making a U-turn?

Give an arm signal as well as using your indicators
Check road markings to see that U-turns are permitted
Look over your shoulder for a final check
Correct answer
Select a higher gear than normal

DVSA theory test explanation

If you have to make a U-turn, slow down and make sure that the road is clear in both directions. Make sure that the road is wide enough for you to carry out the manoeuvre safely. Use your mirrors and look round to check it's safe before turning across the road.