[单选题]What displeased David Marcus and made him to write a critical letter to his employees？

A.No, it is not. It has revealed PayPal's problems in morale and culture.
B.He should find the root of the problem and figure out how to fix it with his executive board and even the whole company.
C.Some of his employees didn't want to install the PayPal app, and others didn't even remember their PayPal passwords.
D.Passion, enthusiasm, and professionalism.
E.Why are the employees not using the app？ If they use it, how should it be improved？ What are their needs？
F.He said that they should leave the company and find something they embrace.
G.You can compel the staff to use it, but you cannot force consumers to buy it.