For me, the answer is B. pay the subjects to pose in front of the camera.
People should be fully aware that they are a part a photo shoot and as a responsible photographer, Donna should be transparent on the process of his photo shoots and she should inform her subjects on how she intended to use those images. This could only be done, if she talked to her subjects and let them pose at the front of the camera fully. A little token will be appreciated if she pays her subjects not only monetary but rather some items that they could appreciate.