Why do military costs make up such a large portion of state GDP?

Group of answer choices

Security concerns. States fear that they'll be invaded and taken over, so they spend inordinate amounts of money to ensure that won't happen

States have obligations to the UN to have certain percentages of their GDP be in military expenditures

States need to invest in military equipment for jobs at home, since most states have domestic arms manufacturers that provide equipment to all their forces

No answer text provided.