Correct!

When riding some motorcycles, your shoulders and arms can obstruct your view in the mirrors. What can you do to overcome this difficulty?

Indicate earlier than normal
Fit smaller mirrors
Extend the mirror arms
Correct answer
Brake earlier than normal

DVSA theory test explanation

It's essential that you have a clear view all around. Adjust your mirrors to give you the best view of the road behind. If your body obscures the view, try fitting mirrors with longer stems.