Can anyone solve this ukcat puzzel and explain their reasoning?

Question

http://www.ukcat.ac.uk/pages/details.aspx?page=abstractReasoning

Answer 1

Are you talking about the sample question?

If you are, the test shape belongs in set A.  All the shapes in set A are made up of curved lines, while everything in set B is made up of straight lines.  So, the test shape, which consists purely of curved lines, must belong to set A.

Answer 2

A is round, B is straight, the sample is round, so it is round. it's logic baby!