What should be subtracted from -5/4 to get -1? (i) -1/4 (ii) 1⁄4 (iii) 1 (iv) -3/4

Shown here are the three essential steps in a proof of the pythagorean theorem. comparing the 1st and 3rd steps how are the colored regions related as to the areas? a. yellow+blue=orange b. orange=yellow=green c.yellow+blue=green=orange d.yellow+green=orange+blue