Which One of the Following Is a Criticism of Graicunas's

Which one of the following is a criticism of Graicunas's work in span of management?

A) He failed to emphasize the importance of span of management on the organization.
B) He does not recognize the principle of unity of command.
C) He does not consider the number of actual relationships among superiors and subordinates.
D) He fails to specify what will happen if the number of subordinates increases or decreases.
E) He takes into account managers' relationships outside the organization.