It will be b, because for these you have to perform the pythagorean theorem. Which is a2+b2=c2 so you plug in the 8 and 14 so it will be 8^2+14^2=c^2 and then you solve 8^2=64 and 14^2=196 add them together and get 260 then you square root that to get your hypothesis of 16.1.