Seisin and Vendee, standing on Greenacre, orally agreed to its sale and purchase for $5,000, and orally marked its bounds as "that line of trees down there, the ditch that intersects them, the fence on the other side, and that street on the fourth side." In which of the following is the remedy of reformation most appropriate? 
As later reduced to writing, the agreement by clerical mistake included two acres that are actually beyond the fence.  Vendee reasonably thought that two acres beyond the fence were included in the oral agreement but Seisin did not. As later reduced to writing, the agreement included the two acres.  Vendee reasonably thought that the price orally agreed upon was $4,500, but Seisin did not. As later reduced to writing, the agreement said $5,000.  Vendee reasonably thought that a dilapidated shed backed up against the fence was to be torn down and removed as part of the agreement, but Seisin did not. As later reduced to writing, the agreement said nothing about the shed. 