Alandowner and her neighbor owned adjoining tracts of land. no public road abutted the neighbor's land, so the landowner granted the neighbor an express easement over the north 25 feet of the landowner's land. however, the following month the county extended the public road to the neighbor's land, and he ceased using the easement for ingress and egress. twenty years later, the neighbor conveyed the easement to his friend, who owned the land adjoining the other side of the landowner. the following year, the neighbor conveyed his land to the landowner. none of the parties has used the easement since the public road was extended. the jurisdiction has a 15-year statute of limitations for acquiring property interests by adverse possession. at what point was the easement extinguished? a when the neighbor attempted to convey the easement to the friend without conveying the dominant tenement itself. b fifteen years after the neighbor ceased using the easement. c when the neighbor conveyed his land to the landowner. d the easement was not extinguished.