Please help solve this using GEMS. Take a photo of your work and attach it to your answer. Please help and give legitimate answers

This is so hard and it’s for a test

In triangles abc and wxy, a=w and b=x which of the following must be true to prove abc=wxy by the aas theorem? a.ab=bc b.bc=xy c.ab=wx d.

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?