(2)
for this problem i did 2.5/8 = 1.5/4.8, then i cross multiplied and got 12=12 so i would assume that the polygons are infact similar? it must be b or c based on this, but i am pretty confused about the whole ratio part.

You are correct in saying that the figures are similar; however, the ratio you picked is incorrect. The ratio is 8:4.8 which represents the ratio of JK to PQ

Notice how JK and PQ are the first two letters of JKML and PQRS respectively. So they correspond to one another. Furthermore, notice that 8/4.8 = 1.667 approximately. Also, KM/QR = 2.5/1.5 = 1.667 approximately as well. KM and QR are the two middle letters of JKML and PQRS respectively. The fact we get 1.667 approximately both times, and because of the congruent angles, proves the figures to be similar. 

In short, the actual answer is choice B