Ron Was Employed by Mass Co

Ron was employed by Mass Co.in 1970.At that time,he was given an employee handbook that described the particular steps that had to be taken before an employee could be fired.Later,in 2000,Mass published a new handbook by which all workers' statuses were changed to at-will employees.Mass then fired Ron.Ron claimed he was terminated without cause and was not afforded procedures described in the 1970 handbook,such as an appeal or review of the decision.He sued Mass under breach of contract based upon the 1970 employee handbook.Will he succeed?

A) Yes,because the modifications in 2000 were not by mutual consent and for consideration.
B) No,because the employee handbook contains terms and conditions of the employment contract.
C) Yes,because Mass Co.has arbitrarily terminated Ron.
D) No,because Ron had acquiesced to the modification by not raising any objection.