We have worked as volunteers at this SOS village for 3 months.

A. It’s 3 months since we stopped working as volunteers at this SOS village.

B. We last worked as volunteers as at this SOS village 3 months ago.

C. It’s 3 months since we didn’t work as volunteers as at this SOS village.

D. It’s 3 months since we worked as volunteers at this SOS village.