Which of the Following Best Describes Stealth Sponsorship

Which of the following best describes stealth sponsorship?

A) It is when corporations pay journalists to give negative opinions about their competitors in their editorials.
B) It is when corporations embed hidden messages in newspaper advertisements to unconsciously stimulate ^{people to want something.}
C) It is when journalists are paid by corporations to receive favorable treatment in their editorials.
D) It is when corporations partner with ancillary firms that they deal with to receive monetary favors from them.