Which of the Following Is True About Span of Control

Which of the following is true about span of control?

A) The more different the functions performed by employees, the greater the span of control can be.
B) The more complex the functions performed by subordinates, the greater the span of control can be.
C) The less time a manager needs to spend on planning, the greater the span of control can be.
D) The further apart the subordinates are physically, the greater the span of control can be.