One Drawback of Corporate Sponsorships and Other Projects in Which

One drawback of corporate sponsorships and other projects in which corporations become involved in the school system is that

A) many efforts turn out to be a violation of PRSA and IABC codes of ethics
B) many efforts result in fraud and the loss of company money and property
C) many efforts are prohibited or limited by school board rules and policies
D) many efforts fail to produce any results
E) all of the above