Mike Morrell Is a Production Supervisor in Porco Rosso, an Aircraft

Mike Morrell is a production supervisor in Porco Rosso, an aircraft manufacturing firm. After evaluating Mike's managerial capabilities, some members of the senior management feel that average productivity would improve if more workers are assigned to him. However, some managers are skeptical about Mike's ability to handle more workers.
-Which of the following statements, if true, would support the argument favoring increased span of control?

A) Mike's team consists of highly experienced and skilled labor.
B) Porco Rosso recently became the world's leading aircraft manufacturer.
C) Mike is receiving increasing complaints about interpersonal conflicts within the team.
D) Mike's team is highly dependent on his guidance, even on minor issues.
E) When additional workers were assigned to Mike on a previous occasion, it had led to unfavorable results.