All of the Following Are "Guidelines" for Grouping Activities in a Level

All of the following are "guidelines" for grouping activities in a level 0 DFD except:

A) group activities if they occur in the same place and at the same time
B) group activities if they occur at different times in the same place
C) group activities if they occur at the same time but in different places
D) group activities that seem to be logically related