Manuela's Grandfather Promised to Loan Her $3000 to Help Her

Manuela's grandfather promised to loan her $3000 to help her to finish year 12.She promised to repay him six months after she commenced paid work.Although Manuella has been working for two years she has never attempted to repay her grandfather.If he sues Manuela,which statement indicates the most likely legal result? Ignore the issue of legal intention.

A) Manuela's grandfather would not succeed because a moral obligation does not provide good consideration.
B) Manuela's grandfather would not succeed because Manuela's consideration is past consideration.
C) Manuela's grandfather would succeed and Manuela would have to repay the money because the consideration is not vague.
D) Manuela's grandfather would succeed because Manuela's consideration is future consideration.