The answer is 57%. If they have lost 3 out of 7 games, that means that they have won 4 out of 7 games. 4 is more than 50% of 7, and 57% is the only figure on there which is over 50.
If it wasn't that easy to find the answer though, you would divide 1 by 7 and then multiply it by 4 to get approximately 57%.
