Reasoning/logic question: Premises, conclusion?

Premises: If a non-profit organization receives a grant increase, volunteers who are already on staff at the time of the increase will receive pay for their work. This will probably attract more volunteers, who will hope that they will eventually be paid. The non-profit organization’s grant was increased.

Conclusion: There were no volunteers to work in the program in the subsequent year.

A. Necessarily true.

B. Probably, but not necessarily true.

C. Indeterminable, cannot be determined.

D. Probably, but not necessarily false.

E. Necessarily false.

I think the answer is E, but its just a guess and can’t really identify the WHY. I also think it might be D. Not sure…