I am struggling with this one. I've been working on it for a while now and can't seem to figure it out. Any help understanding these would be a great help!

If tom sues for breach of contrac,t and Bill wants to deny that the obligantion was ever created, and the action is in covenant, he would plead:
A: Nul tiel record
B: Non est factum
C: Nil debet
D: Non cepit
I believe it's "A" but I am not positive.
Please can someone help me. These above terms are all a little confusing to me!

Thank you so much!