Which of the Following Are Among the Challenges Faced by Project

Multiple Choice

Which of the following are among the challenges faced by project managers?​ 

A)  They frequently have more authority than responsibility. 
B)  They must effectively deal with networks of people both within and outside the parent company. 
C)  They must learn how to accomplish project work unilaterally - on their own. 
D)  They are not allowed to be flexible about how the project should be accomplished.