Hardest question on the internet. can you

I believe it's the 2nd answer.

ABD is congruet to ACD by the SAS Postulate

Well, you can find the equation using the two points that are given: (4,1) and (0,3). The answer should probably be in slope intercept form: y=mx+b. M is the slope and b is the y intercept.
The first step is to find the slope which is y1-y2 over x1-x2. This would equal 2.
Since we already know the y intercept, we just plug it in.
y=2x+3