The Three Countries of Ophir,Shem,and Turan Produce the Entire World

The three countries of Ophir,Shem,and Turan produce the entire world supply of carbomite.They have signed an agreement to limit their production of carbomite in order to act as a monopolist.Each country is deciding if it should honour the agreement or if it should cheat.If all three countries honour the agreement,each will earn $100 million.If all three countries cheat on the agreement,each will earn $30 million.If two of the countries honour the agreement and one cheats,then the two honouring the agreement will each earn $60 million and the cheater will earn $140 million.If only one country honours the agreement and the other two cheat,then the one honouring the agreement will earn $20 million and the two cheaters will each earn $70 million.To make the most money,what should Ophir do and how much will it earn

A) should cheat, and will earn $30 million
B) should honour the agreement, and will earn $60 million
C) should cheat, and will earn $140 million
D) should honour agreement, and will earn 100 million.