Grace Is an Hourly Bakery Employee for an Independently-Owned Doughnut

Grace is an hourly bakery employee for an independently-owned doughnut shop.She has worked for the owner for two years,and she has consistently received good performance appraisals and raises.She is well-liked by the owner and her co-workers.Yesterday,the owner called Grace in and said,"I'm so sorry,Grace.My nephew,Ace,has been released from the federal penitentiary and no one will hire him.My sister is at her wits' end,and she has asked me to find him a job.I'm giving Ace your job.Here are two weeks wages in lieu of notice.Good luck.I'll be happy to write a good reference for you." Which of the following statements is TRUE?

A) Grace has a strong case for constructive discharge.
B) Grace is an at-will employee and she has no case against her former employer.
C) Grace can sue for her job back under the "public policy" exception to employment-at-will.
D) Grace has been fired for just cause.