Justin Agrees to Start a Life-Size Portrait of Julia Beginning

Multiple Choice

Justin agrees to start a life-size portrait of Julia beginning 2^nd November.On the 28^th of October he writes to Julia that due to unforeseeable circumstances he would not be able to perform his promise,Justin has used the doctrine of:

A) accord and satisfaction.
B) anticipatory repudiation.
C) specific performance.
D) quasi-contract.