'The efficiency of a pile in a group is defined by
ALoad carried by the largest pile in the group / Load carried by the smallest pile in the group
BMaximum load carried by a pile in the group / Minimum load carried by a pile in the group
CMinimum load carried by a pile in the group / Maximum load carried by a pile in the group
DAverage load carried by a pile in the group / Load carried by a single pile