Digital Services Corporation (DSC) Promises to Hire Ellen

Digital Services Corporation (DSC) promises to hire Ellen. The day before Ellen is to start work, DSC revokes the promise. In Ellen's suit against DSC, the court is most likely to hold that DSC is not liable to Ellen if

A) Ellen's promised employment is at-will.
B) Ellen falls under the protection of a federal or state statute.
C) Ellen has an employment contract.
D) Ellen quit a previous job and moved to a new city to work for DSC.