Steve, Rob, and Charley Own a Building as Joint Tenants

Steve, Rob, and Charley own a building as joint tenants with the right of survivorship. Steve conveyed his interest in the building to Mary by executing and delivering a deed to Mary. Rob and Charley did not know about the transfer and did not consent to it. Rob and Charley then died. After their deaths, what would Mary's interest in the building be?

A) A 1/3 interest as a tenant in common
B) A 1/3 interest as a joint tenant
C) Total ownership due to the deaths of Rob and Charley
D) No interest because Rob and Charley did not consent to the transfer