If δuvw is dilated from point u by a scale factor of 2, which of the following equations is true about segment a prime b prime?

triangle uvw is shown with point a lying on side uv and point b lying on side uw. line ab is perpendicular to side uw.
segment a prime b prime = one half segment ab segment a prime b prime = two segment ab segment a prime b prime = segment ab segment a prime b prime = three segment ab