Which of the Following Communications with External Audiences Could Be

Which of the following communications with external audiences could be effectively done through a press conference?

A) an announcement by Ryanair,the Irish low cost airlines,that it was reducing its fares by 5 percent and introducing seven new routes
B) an announcement by Exxon,that it earned more than $100 billion in 2007,the biggest profit in American corporate history
C) an announcement by the state of Georgia to end to its "green space" program in which it had required developers to preserve a certain percentage of each development in its natural form
D) Coca-Cola's announcement that it is was going to run an IMC program with Turner Broadcasting to promote Diet Coke
E) All of the above demonstrate an effective use of a press conference.